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A119532 Number of n-ominoes plus number of n-iamonds. 0
2, 2, 2, 3, 8, 16, 47, 132, 435, 1445, 5103, 18259, 66934, 247826, 928137, 3500559, 13290552, 50712016, 194358380, 747624825, 2885120934, 11164896416, 43313276948, 168400053019, 656028153120, 2560227845391, 10007858038797, 39178672900385, 153586295761270, 602842558581537, 2368994981198048 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
COMMENTS
Number of polyominoes with n cells plus number of polyiamonds with n cells. Turning over is allowed; holes are allowed.
LINKS
FORMULA
a(n) = A000105(n) + A000577(n).
CROSSREFS
Sequence in context: A351108 A184311 A110910 * A010583 A306343 A238188
KEYWORD
nonn
AUTHOR
Jonathan Vos Post, May 28 2006
EXTENSIONS
More terms from John Mason, Jan 08 2023
STATUS
approved

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Last modified April 14 05:31 EDT 2024. Contains 371655 sequences. (Running on oeis4.)