119280

Appears in sequences

• Trails of length n on honeycomb lattice.at n=17A006851
• 1/3 of product of three numbers: the n-th prime, the previous number and the following number.at n=19A127919
• Numbers k such that 11^phi(k) == 1 (mod k^2), where phi(k) = A000010(k).at n=27A253016
• E.g.f.: exp( Sum_{n>=1} x^(3*n) / n^3 ) = Sum_{n>=0} a(n) * x^(3*n) / (3*n)!.at n=3A258873
• a(n) = largest k such that A049820(k) <= A262509(n).at n=3A263083
• a(n) = largest k such that A049820(k) <= A262509(n).at n=4A263083
• Triangular array read by rows: T(n,k) is the number of labeled posets on [n] that are composed of exactly k irreducible posets, n >= 0, 0 <= k <= n.at n=32A354615