Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.

A260063

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.

Terms

    a(0) =48a(1) =91a(2) =256a(3) =557a(4) =956a(5) =2131a(6) =5088a(7) =10235a(8) =20242a(9) =45355a(10) =99168a(11) =201609a(12) =422888a(13) =924655a(14) =1959672a(15) =4072719a(16) =8679398a(17) =18623703a(18) =39243888a(19) =82677405a(20) =176286268a(21) =374837907a(22) =791289656a(23) =1676354907a(24) =3565263074a(25) =7557825083a(26) =15992930920

External references