Number of cells in the first column of all directed column-convex polyominoes of area n+1.

A054963

Number of cells in the first column of all directed column-convex polyominoes of area n+1.

Terms

    a(0) =1a(1) =3a(2) =9a(3) =26a(4) =72a(5) =194a(6) =515a(7) =1357a(8) =3563a(9) =9340a(10) =24466a(11) =64068a(12) =167749a(13) =439191a(14) =1149837a(15) =3010334a(16) =7881180a(17) =20633222a(18) =54018503a(19) =141422305a(20) =370248431a(21) =969323008a(22) =2537720614a(23) =6643838856a(24) =17393795977a(25) =45537549099a(26) =119218851345

External references