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A210997 Number of free polyominoes with 2n-1 cells. 3
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

Table of n, a(n) for n=1..19.

Eric Weisstein's World of Mathematics, Polyomino

Wikipedia, Polyomino

CROSSREFS

Bisection of A000105.

Cf. A000988, A210989, A210996.

Sequence in context: A177409 A212273 A055897 * A052563 A316704 A228173

Adjacent sequences:  A210994 A210995 A210996 * A210998 A210999 A211000

KEYWORD

nonn

AUTHOR

Omar E. Pol, Sep 15 2012

STATUS

approved

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Last modified October 21 13:24 EDT 2019. Contains 328299 sequences. (Running on oeis4.)