54430

Appears in sequences

• Matrix inverse of triangle A117334.at n=50A117335
• Number of palindromes (in base 6) below 6^n.at n=10A117865
• G.f. A(x) satisfies A(x/A(x)^2) = 1 + x ; thus A(x) = 1 + Series_Reversion(x/A(x)^2).at n=7A120970
• Triangle T(n,k), n>=0, 0<=k<=C(n,2), read by rows: T(n,k) = number of k-length chains in the poset of Dyck paths of semilength n ordered by inclusion.at n=20A193629
• a(n) = (binomial(2n, n) - 2) mod n^3.at n=41A246133
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of B(x)^k, where B(x) is the g.f. of A120971.at n=42A381602