Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (6,n)-rectangular grid with k '1's and (6n-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.
A228165
Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (6,n)-rectangular grid with k '1's and (6n-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) =3a(3) =9a(4) =10a(5) =9a(6) =3a(7) =1a(8) =1a(9) =3a(10) =21a(11) =55a(12) =135a(13) =198a(14) =246a(15) =198a(16) =135a(17) =55a(18) =21a(19) =3a(20) =1a(21) =1a(22) =6a(23) =48a(24) =218a(25) =813a(26) =2196a(27) =4767a(28) =8070a(29) =11139
External references
- oeis: A228165