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A210997 Number of free polyominoes with 2n-1 cells. 4
1, 2, 12, 108, 1285, 17073, 238591, 3426576, 50107909, 742624232, 11123060678, 168047007728, 2557227044764, 39153010938487, 602621953061978, 9317706529987950, 144648268175306702, 2253491528465905342, 35218318816847951974 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Polyomino
Wikipedia, Polyomino
CROSSREFS
Bisection of A000105.
Sequence in context: A360950 A212273 A055897 * A052563 A316704 A228173
KEYWORD
nonn
AUTHOR
Omar E. Pol, Sep 15 2012
STATUS
approved

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Last modified May 18 15:05 EDT 2024. Contains 372641 sequences. (Running on oeis4.)