55629

Appears in sequences

• Number of positive integers <= 2^n of form 5 x^2 + 10 y^2.at n=20A054180
• Number T(n,k) of colored set partitions of [n] where colors of the elements of subsets are distinct and in increasing order and exactly k colors are used; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=31A322670