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A275943
Number of prefix-closed polyominoes of area n.
0
1, 2, 6, 19, 61, 197, 640, 2091, 6860, 22566, 74365, 245397, 810639, 2680025, 8865866
OFFSET
1,2
LINKS
Enrico Formenti and Paolo Massazza, From Tetris to Polyominoes Generation, Proceedings of GASCom 2016 conference, 2016.
CROSSREFS
Sequence in context: A022015 A138747 A052975 * A228180 A035929 A071646
KEYWORD
nonn,more
AUTHOR
Enrico Formenti, Aug 13 2016
STATUS
approved