26082

Appears in sequences

• Degrees of irreducible representations of Conway group Co3.at n=20A003910
• Numbers k such that 109*2^k+1 is prime.at n=7A032404
• Generalized Stirling number triangle of the first kind.at n=33A051231
• Triangle, read by rows, of Stirling numbers of second kind, S2(n,k), multiplied by k^k, for n >= 1, 1<=k<=n.at n=30A105197
• Numbers k such that phi(k)*sigma(k) is a cube.at n=16A114077
• a(n) is the ratio of the sum of squares of the bends of the circles that are added in the n-th generation of Apollonian packing, to the sum of squares of the bends of the initial three circles.at n=4A154637
• a(n) = (4*n+1)*(4*n+2) = (4*n+2)!/(4*n)!.at n=40A157870
• A symmetrical triangle based on Stirling numbers of the second kind :q=3;t(n,m,q)=If[m == 0 Or m == n, 1, If[Floor[n/2] greater than or equal to m, StirlingS2[ n, m]*q^m, StirlingS2[n, n - m]*q^(n - m)]].at n=39A174546
• A symmetrical triangle based on Stirling numbers of the second kind :q=3;t(n,m,q)=If[m == 0 Or m == n, 1, If[Floor[n/2] greater than or equal to m, StirlingS2[ n, m]*q^m, StirlingS2[n, n - m]*q^(n - m)]].at n=41A174546
• Expansion of (psi(-x) * phi(x)^4)^2 in powers of x where phi(), psi() are Ramanujan theta functions.at n=38A209942
• Expansion of (psi(x) * phi(-x)^4)^2 in powers of x where phi(), psi() are Ramanujan theta functions.at n=38A215472
• Largest number k such that phi(k) = A007374(n).at n=33A224532
• Number of ways to place 2n rooks on an n X n board, with 2 rooks in each row and each column, multiple rooks in a cell allowed, and exactly 2 rooks below the main diagonal.at n=6A260585
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 609", based on the 5-celled von Neumann neighborhood.at n=29A273210
• a(n) = 81*n^2 - 9*n.at n=18A277991
• Maximum number of 6 sphinx tile shapes in a sphinx tiled hexagon of order n.at n=26A291582
• Number of ways to write n as an ordered sum of 7 primes.at n=32A340963
• a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(2*j*k) / phi(k).at n=33A372664
• Expansion of 1/(2 - 1/(1 - 9*x)^(1/3)).at n=5A373818
• a(n) = Sum_{k=0..n} binomial(n+k-1,k) * binomial(n+2*k-1,n-k).at n=6A378566