Irregular triangle read by rows: T(n,k) is the number of regions between the free polyominoes, with n cells and width k, and their bounding boxes, n >= 1, 1 <= k <= ceiling(n/2).

A380283

Irregular triangle read by rows: T(n,k) is the number of regions between the free polyominoes, with n cells and width k, and their bounding boxes, n >= 1, 1 <= k <= ceiling(n/2).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =0a(5) =5a(6) =0a(7) =7a(8) =14a(9) =0a(10) =19a(11) =52a(12) =0a(13) =34a(14) =173a(15) =48a(16) =0a(17) =74a(18) =503a(19) =384a(20) =0a(21) =134a(22) =1368a(23) =1918a(24) =210a(25) =0a(26) =282a(27) =3642a(28) =7742a(29) =2307

External references