38410

Appears in sequences

• a(1)=1, a(n) = n*21^(n-1) + a(n-1).at n=3A014938
• a(n) = 1 + 2*n + 3*n^2 + 4*n^3.at n=21A056578
• Expansion of Product_{k>=1} ((1 + x^k) / (1 - x^(5*k)))^k.at n=21A285459
• Number of 5 X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=7A302282