The number of binary pattern classes in the (2,n)-rectangular grid with 8 '1's and (2n-8) '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.

A228583

The number of binary pattern classes in the (2,n)-rectangular grid with 8 '1's and (2n-8) '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) =1a(5) =15a(6) =135a(7) =777a(8) =3270a(9) =11034a(10) =31650a(11) =80190a(12) =184239a(13) =391105a(14) =777777a(15) =1464255a(16) =2630940a(17) =4540836a(18) =7567380a(19) =12228780a(20) =19229805a(21) =29512035a(22) =44313643a(23) =65239845a(24) =94345218a(25) =134229150a(26) =188145750a(27) =260129610a(28) =355138875a(29) =479217141

External references