A056785 Number of polydominoes.

1, 4, 23, 211, 2227, 25824, 310242, 3818983, 47752136

Offset

1,2

Comments

From Vicher's table.

This gives 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

Herman Tulleken, Polyominoes 2.2: How they fit together, (2019).

M. Vicher, Polyforms

Index entries for sequences related to dominoes

Formula

a(n) + A213376(n) = A210996(n). - R. J. Mathar, Jan 30 2023

Crossrefs

Cf. A056786, A213376, A213377, A213378.

Sequence in context: A365353 A265677 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