17962560

Appears in sequences

• Number of lower triangles of an n X n 0..4 array with new values introduced in row major order 0..4 and no two horizontal or vertical neighbors of any element equal.at n=5A194889
• T(n,k)=Number of lower triangles of an n X n 0..k array with new values introduced in row major order 0..k and no two horizontal or vertical neighbors of any element equal.at n=41A194893
• Triangle read by rows: T(n,k) is the number of labeled forests with n trees and 2n nodes and with the largest tree having exactly k nodes, (n >= 1, 2 <= k <= n+1).at n=19A332959
• Expansion of Product_{k>=1} (1 + 6^(k-1)*x^k).at n=10A344065
• Expansion of e.g.f. (1 - x^2)^(-x).at n=11A353226