Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111.

A260369

Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111.

Terms

    a(0) =2880a(1) =4438a(2) =13632a(3) =32488a(4) =37948a(5) =98032a(6) =265120a(7) =390138a(8) =774416a(9) =2085610a(10) =3676672a(11) =6576428a(12) =16343884a(13) =32624460a(14) =57557052a(15) =130763122a(16) =277382484a(17) =506936080a(18) =1070477816a(19) =2319259576a(20) =4413899664a(21) =8938596854a(22) =19280847812a(23) =38024306356

External references