Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010101.

A260469

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010101.

Terms

    a(0) =49a(1) =92a(2) =213a(3) =471a(4) =1085a(5) =2562a(6) =5891a(7) =13530a(8) =31372a(9) =72451a(10) =166919a(11) =385563a(12) =890572a(13) =2054927a(14) =4743628a(15) =10953016a(16) =25283529a(17) =58363941a(18) =134740753a(19) =311052242a(20) =718052661a(21) =1657646568a(22) =3826724610a(23) =8834001277a(24) =20393409965a(25) =47078589297

External references