

A259087


Number of ncelled 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, 168413249, 652292925, 2531493604, 9845752518, 38372748112
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OFFSET

1,4


LINKS

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.


FORMULA



CROSSREFS



KEYWORD

nonn,more


AUTHOR



EXTENSIONS



STATUS

approved



