80521055domain: NAppears in sequencesNumber of columns in all directed column-convex polyominoes of area n+1.at n=17A038731Row sums of triangle A134511.at n=34A134512p-INVERT of (0,1,0,1,0,1,...), where p(S) = 1 - S - S^2 + S^3.at n=34A291241