A275943 Number of prefix-closed polyominoes of area n.

1, 2, 6, 19, 61, 197, 640, 2091, 6860, 22566, 74365, 245397, 810639, 2680025, 8865866

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Enrico Formenti and Paolo Massazza, From Tetris to Polyominoes Generation, Proceedings of GASCom 2016 conference, 2016.

Crossrefs

Cf. A000105, A001168.

Sequence in context: A022015 A138747 A052975 * A228180 A035929 A071646

Adjacent sequences: A275940 A275941 A275942 * A275944 A275945 A275946

Keyword

nonn,more

Author

Enrico Formenti, Aug 13 2016

Status

approved