904840

Appears in sequences

• Triangle read by rows: T(n,k) is the number of non-derangement permutations of {1,2,...,n} having genus k (see first comment for definition of genus).at n=48A178517
• p-INVERT of (1,1,1,1,1,...), where p(S) = (1 - 2 S^2)^2.at n=14A291024