Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (7,n)-rectangular grid with k '1's and (7n-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.
A228166
Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (7,n)-rectangular grid with k '1's and (7n-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) =4a(3) =12a(4) =19a(5) =19a(6) =12a(7) =4a(8) =1a(9) =1a(10) =4a(11) =28a(12) =94a(13) =266a(14) =508a(15) =777a(16) =868a(17) =777a(18) =508a(19) =266a(20) =94a(21) =28a(22) =4a(23) =1a(24) =1a(25) =8a(26) =65a(27) =363a(28) =1574a(29) =5231
External references
- oeis: A228166