Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010001.

A260201

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010001.

Terms

    a(0) =44a(1) =80a(2) =207a(3) =479a(4) =1163a(5) =2864a(6) =6895a(7) =16690a(8) =40598a(9) =98367a(10) =238383a(11) =578373a(12) =1402450a(13) =3400311a(14) =8246174a(15) =19996576a(16) =48488613a(17) =117582381a(18) =285129777a(19) =691413726a(20) =1676626449a(21) =4065695950a(22) =9858990214a(23) =23907290449a(24) =57973356043a(25) =140580903753

External references