Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1111-1111 pattern in any orientation.

A146935

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1111-1111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =1a(5) =5a(6) =1a(7) =10a(8) =7a(9) =62a(10) =25a(11) =420a(12) =89a(13) =3595a(14) =559a(15) =35290a(16) =4332a(17) =459986a(18) =47525a(19) =9058999a(20) =720844a(21) =232457113a(22) =13515353a(23) =7854920994a(24) =345530332a(25) =353173272787a(26) =11945906159a(28) =546900316419

External references