1779222

Appears in sequences

• Triangle T(n, k) read by rows; given by [0, 1, 0, 1, 0, 1, ...] DELTA [1, 1, 2, 5, 14, 42, 132, 429, 1430, ...] (A000108) where DELTA is Deléham's operator defined in A084938.at n=34A085845
• Expansion of A(x)^2, where A(x) = o.g.f. of n^n (A000312).at n=7A100262