A259087 Number of n-celled polyominoes which are of rectangular but not square type.

0, 1, 1, 4, 6, 28, 83, 289, 1030, 3860, 14154, 53222, 202001, 771255, 2945803, 11304541, 43564276, 168413249, 652292925, 2531493604, 9845752518, 38372748112

Offset: 1

Author

N. J. A. Sloane, Jun 18 2015

Keywords

• nonn
• more

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.

Crossrefs

Cf. A259088, A000105.

Formula

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

Extensions

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

a(18)-a(22) from John Mason, Nov 19 2021