Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (4,n)-rectangular grid with k '1's and (4n-k) '0's: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other.
A225812
Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (4,n)-rectangular grid with k '1's and (4n-k) '0's: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =2a(5) =1a(6) =1a(7) =2a(8) =10a(9) =14a(10) =22a(11) =14a(12) =10a(13) =2a(14) =1a(15) =1a(16) =4a(17) =22a(18) =60a(19) =139a(20) =208a(21) =252a(22) =208a(23) =139a(24) =60a(25) =22a(26) =4a(27) =1a(28) =1a(29) =4
External references
- oeis: A225812