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A056785 Number of polydominoes. 7
1, 4, 23, 211, 2227, 25824, 310242, 3818983, 47752136 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

From Vicher's table.

This counts the number of polyominoes of order 2n that can be tiled by dominoes in at least one way. - Joseph Myers, Jun 10 2012

LINKS

Table of n, a(n) for n=1..9.

M. Keller, Counting Polyforms

M. Vicher, Polyforms

Index entries for sequences related to dominoes

CROSSREFS

Cf. A056786, A213376, A213377, A213378.

Sequence in context: A222454 A099869 A221371 * A188404 A105747 A099692

Adjacent sequences:  A056782 A056783 A056784 * A056786 A056787 A056788

KEYWORD

hard,more,nonn

AUTHOR

James A. Sellers, Aug 28 2000

EXTENSIONS

Edited by T. D. Noe, Apr 09 2009

Offset corrected and a(6)-a(9) added by Joseph Myers, Jun 10 2012

STATUS

approved

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Last modified August 28 18:07 EDT 2015. Contains 261154 sequences.