A056879 - OEIS

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A056879

Number of n-celled axially symmetric polyominoes without holes.

0, 0, 0, 1, 2, 6, 9, 23, 37, 87, 138, 313, 510, 1130, 1859, 4070, 6786, 14750, 24811, 53715, 91096, 196769, 335815, 724470, 1243175, 2680212, 4619999, 9957652 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,5`
	LINKS	`Table of n, a(n) for n=1..28.` `Tomás Oliveira e Silva, Enumeration of polyominoes`
	CROSSREFS	`Cf. A000105, A006746.` `Sequence in context: A048083 A127931 A077237 * A006746 A205875 A243558` `Adjacent sequences: A056876 A056877 A056878 * A056880 A056881 A056882`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane, Sep 03 2000`
	STATUS	`approved`

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Last modified April 22 19:11 EDT 2021. Contains 343177 sequences. (Running on oeis4.)