Irregular triangle read by rows: T(n,k) is the number of free polyaboloes (or polytans) with n cells of which 2*k share a hypotenuse in pairs (making up k squares), 0 <= k <= n/2.

A391191

Irregular triangle read by rows: T(n,k) is the number of free polyaboloes (or polytans) with n cells of which 2*k share a hypotenuse in pairs (making up k squares), 0 <= k <= n/2.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =1a(4) =3a(5) =1a(6) =6a(7) =7a(8) =1a(9) =7a(10) =19a(11) =4a(12) =13a(13) =61a(14) =31a(15) =2a(16) =18a(17) =149a(18) =137a(19) =14a(20) =31a(21) =362a(22) =580a(23) =138a(24) =5a(25) =45a(26) =795a(27) =1989a(28) =860a(29) =54

External references