The number of binary pattern classes in the (2,n)-rectangular grid with 7 '1's and (2n-7) '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.

A228582

The number of binary pattern classes in the (2,n)-rectangular grid with 7 '1's and (2n-7) '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) =0a(4) =2a(5) =32a(6) =198a(7) =868a(8) =2860a(9) =7984a(10) =19380a(11) =42696a(12) =86526a(13) =164560a(14) =296010a(15) =509132a(16) =841464a(17) =1345184a(18) =2086920a(19) =3155472a(20) =4660890a(21) =6745152a(22) =9580142a(23) =13381940a(24) =18407268a(25) =24972112a(26) =33446140a(27) =44276440a(28) =57979350a(29) =75170160

External references