19278

Appears in sequences

• Number of 7-ary search trees on n keys.at n=16A019501
• Triangular matrix arising in enumeration of catafusenes, read by rows.at n=50A038763
• Least m such that n = m mod tau(m) if such m exists, otherwise 0.at n=37A066708
• Triangle of generalized Chebyshev coefficients.at n=39A080419
• a(n) = (n+1)*(n+2)*(n+3)*(n+12)*3^n/72.at n=5A080422
• Dimensions of the irreducible representations of the simple Lie algebra of type F4 over the complex numbers, listed in increasing order.at n=14A121738
• Smallest k > 1 such that (sum of digits of k^n)*(sum of digits of k^(n+1)) = k, or 0 if no such k exists.at n=6A126783
• Triangle whose rows are generated by A136157^n * [1, 1, 0, 0, 0, ...].at n=49A136158
• Fibonacci matrix read by antidiagonals. (Inverse of A136158.)at n=49A164948
• Numbers k such that phi(phi(k)) = sigma(rad(k)).at n=28A173748
• Molecular topological indices of the pan graphs.at n=32A192836
• Number of arrays of 5 integers in -n..n with sum zero and the sum of every adjacent pair being odd.at n=12A202077
• Expansion of (psi(-x) * phi(x)^4)^2 in powers of x where phi(), psi() are Ramanujan theta functions.at n=29A209942
• Molien series for invariants of finite Coxeter group A_8.at n=65A266777
• Numbers k such that 10^k - 2001 is prime.at n=12A278471
• Numbers n such that both phi(n) and psi(n) are perfect squares.at n=31A291549
• Main diagonal of A292159.at n=9A292161
• Square array T(m,n) = number of ways to draw m-1 horizontal lines [a(i),b(i)] with 0 <= a(i) < b(i) <= n such that if two lines start or end on the same coordinate, no intermediate line crosses this coordinate (see comments); m, n >= 1.at n=48A298636
• a(n) = 3*(n+1)*(9*n+4).at n=26A304503
• Sum of all the parts in the partitions of n into 6 squarefree parts.at n=42A308903