221610563

Appears in sequences

• Number of columns in all directed column-convex polyominoes of area n+1.at n=18A038731
• Row sums of triangle A134511.at n=36A134512
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = 1 - S - S^2 + S^3.at n=36A291241