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A210988 Number of one-sided polyominoes with 2n cells. 5
1, 7, 60, 704, 9189, 126759, 1802312, 26152418, 385221143, 5741256764, 86383382827, 1309998125640, 19998172734786, 307022182222506, 4736694001644862, 73390033697855860, 1141388483146794007, 17810678207278478530 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Sequence related with polydominoes and other similar sequences. It appears that we can write A216492(n) < A216583(n) < A056785(n) < A056786(n) < A210996(n) < a(n) < A210986(n), if n >= 3. - Omar E. Pol, Sep 16 2012

LINKS

Table of n, a(n) for n=1..18.

Eric Weisstein's World of Mathematics, Polyomino

Wikipedia, Polyomino

CROSSREFS

Bisection of A000988.

Cf. A210989, A210996.

Sequence in context: A024090 A241770 A243695 * A222651 A287689 A289874

Adjacent sequences:  A210985 A210986 A210987 * A210989 A210990 A210991

KEYWORD

nonn

AUTHOR

Omar E. Pol, Sep 16 2012

STATUS

approved

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Last modified June 23 21:09 EDT 2021. Contains 345402 sequences. (Running on oeis4.)