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A259087 Number of n-celled polyominoes which are of rectangular but not square type. 2
0, 1, 1, 4, 6, 28, 83, 289, 1030, 3860, 14154, 53222, 202001, 771255, 2945803, 11304541, 43564276 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

a(n)+A259088(n) = A000105(n).

LINKS

Table of n, a(n) for n=1..17.

T. R. Parkin, L. J. Lander, and D. R. Parkin, Polyomino Enumeration Results, presented at SIAM Fall Meeting, 1967) and accompanying letter from T. J. Lander (annotated scanned copy). See page 21. The 15th entry is not included because their value for A000105(15) was incorrect.

CROSSREFS

Cf. A259088, A000105.

Sequence in context: A122113 A093815 A142859 * A056221 A046849 A090530

Adjacent sequences:  A259084 A259085 A259086 * A259088 A259089 A259090

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Jun 18 2015

EXTENSIONS

a(15)-a(17) computed from A000105-A259088 by Jean-Fran├žois Alcover, Dec 30 2019

STATUS

approved

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Last modified April 10 16:16 EDT 2021. Contains 342845 sequences. (Running on oeis4.)