43080

Appears in sequences

• Expansion of e.g.f. tanh(arctan(x) * exp(x)).at n=8A012415
• a(0)=1. a(n) = sum of the earlier terms which are divisible by (the number of 1's in the binary representation of n).at n=31A123757
• Triangle T(n,k) = Number of k-cycles on the graph of an n-orthoplex. n>=2, k>=3.at n=17A167986
• Let h(m) denote the sequence whose n-th term is Sum_{k=0..n} (k+1)^m*T(n,k)^2, where T(n,k) is the Catalan triangle A039598. This is h(6).at n=3A228332
• Let x be the sum of the divisors d_i of k such that d_i | sigma(k). Sequence lists the numbers k for which x^2 = sigma(k).at n=6A284283
• 4*a(n) is the maximum possible determinant of a 3 X 3 matrix whose entries are 9 consecutive primes starting with prime(n).at n=18A340923