20352

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 71.at n=30A031569
• Low-temperature specific heat expansion for honeycomb net (Potts model, q=3).at n=5A057392
• If n mod 2 = 0 then a(n) = n^4/4 - 2*n^2 + 3*n; otherwise, a(n) = n^4/4 - 2*n^2 + 3*n - 5/4.at n=17A064835
• Triangle, read by rows, where row n equals the inverse binomial transform of the crystal ball sequence for D_n lattice.at n=39A108556
• Number of permutations pi in S_n such that maj pi and maj pi^(-1) have the same parity where maj is the major index. Equivalently, the number of pi such that maj pi and inv pi have the same parity where inv is the inversion number.at n=8A113247
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+833)^2 = y^2.at n=31A129010
• Growth sequence for Richard Thompson's group F with the standard generating set x_0, x_1.at n=9A156945
• Number of binary strings of length n with no substrings equal to 0010 1001 or 1100.at n=14A164501
• Numbers with prime signature {7,1,1}, i.e., of form p^7*q*r with p, q and r distinct primes.at n=26A179696
• Number of -n..n arrays x(0..3) of 4 elements with zero sum, and adjacent elements not equal modulo three (with -1 modulo 3 = 2).at n=22A199911
• Number of 0..n arrays x(0..7) of 8 elements with zero 5th differences.at n=22A200275
• Numbers appearing in A245180.at n=36A245181
• Triangle T(M, N): Number of M X N matrices where 1<N<=M, all elements are distinct, all elements are at least 0 and at most M*N-1, and every 2 X 2 block of elements has the same sum.at n=5A263542
• Number of length-4 0..n arrays with no repeated value differing from the previous repeated value by other than plus or minus one modulo n+1.at n=10A269679
• Numbers n such that (n-1)^3 + (n+1)^3 is a taxi-cab number (A001235).at n=38A272910
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 397", based on the 5-celled von Neumann neighborhood.at n=14A281755
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 534", based on the 5-celled von Neumann neighborhood.at n=14A288984
• Expansion of e.g.f. arcsin(x)*exp(x).at n=9A291482
• Totients t such that the number of divisors of t equals the number of solutions of phi(x) = t.at n=18A305058
• Indices of primes followed by a gap (distance to next larger prime) of 44.at n=17A320720