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A338213
a(n) is the number of free polyominoes with sprawl n.
3
1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 3, 2, 4, 6, 13, 15, 30, 50, 93, 158, 287, 513, 950, 1735, 3212, 5945, 11099, 20720, 38910, 73002, 137821, 259757
OFFSET
0,13
COMMENTS
The sprawl of a polyomino is the number of cells in a polyomino plus the number of cells adjacent to it.
LINKS
Sean A. Irvine, Java program (github)
FORMULA
Antidiagonal sums of A338211.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
STATUS
approved