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

A259087

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

Terms

    a(0) =0a(1) =1a(2) =1a(3) =4a(4) =6a(5) =28a(6) =83a(7) =289a(8) =1030a(9) =3860a(10) =14154a(11) =53222a(12) =202001a(13) =771255a(14) =2945803a(15) =11304541a(16) =43564276a(17) =168413249a(18) =652292925a(19) =2531493604a(20) =9845752518a(21) =38372748112

External references