504886

Appears in sequences

• Number of overpartitions of n: an overpartition of n is an ordered sequence of nonincreasing integers that sum to n, where the first occurrence of each integer may be overlined.at n=36A015128
• Number of ways to choose four collinear points from an n X n grid.at n=21A178256
• Number of overpartitions of n^2; a(n) = A015128(n^2).at n=6A219430
• a(n) = Sum_{k=1..n} 2^k * phi(k), where phi is the Euler totient function A000010.at n=14A324913