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A359522
Number of free, holey, treelike polyominoes of n cells.
1
0, 0, 0, 0, 0, 0, 1, 5, 32, 144, 662, 2835, 11955, 49083, 199029, 796867, 3163384, 12463807
OFFSET
1,8
EXAMPLE
a(7) = 1 because of the holey heptomino.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
John Mason, Jan 04 2023
STATUS
approved