Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (5,n)-rectangular grid with k '1's and (5n-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.
A228022
Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (5,n)-rectangular grid with k '1's and (5n-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) =6a(4) =6a(5) =3a(6) =1a(7) =1a(8) =3a(9) =15a(10) =32a(11) =60a(12) =66a(13) =60a(14) =32a(15) =15a(16) =3a(17) =1a(18) =1a(19) =6a(20) =34a(21) =129a(22) =371a(23) =794a(24) =1310a(25) =1675a(26) =1675a(27) =1310a(28) =794a(29) =371
External references
- oeis: A228022