Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010001.

A260538

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010001.

Terms

    a(0) =75a(1) =131a(2) =310a(3) =566a(4) =976a(5) =2229a(6) =4296a(7) =7576a(8) =16060a(9) =32285a(10) =58636a(11) =118158a(12) =240124a(13) =449449a(14) =881000a(15) =1782816a(16) =3414548a(17) =6616199a(18) =13258972a(19) =25773006a(20) =49827510a(21) =98896019a(22) =193756928a(23) =375388238a(24) =739657558a(25) =1453670523a(26) =2825958650a(27) =5543030018

External references