The number of binary pattern classes in the (2,n)-rectangular grid with 6 '1's and (2n-6) '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.

A228581

The number of binary pattern classes in the (2,n)-rectangular grid with 6 '1's and (2n-6) '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) =0a(1) =0a(2) =0a(3) =1a(4) =10a(5) =60a(6) =246a(7) =777a(8) =2044a(9) =4704a(10) =9780a(11) =18777a(12) =33814a(13) =57772a(14) =94458a(15) =148785a(16) =226968a(17) =336736a(18) =487560a(19) =690897a(20) =960450a(21) =1312444a(22) =1765918a(23) =2343033a(24) =3069396a(25) =3974400a(26) =5091580a(27) =6458985a(28) =8119566a(29) =10121580

External references