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

A260539

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

Terms

    a(0) =193a(1) =310a(2) =774a(3) =1411a(4) =2226a(5) =5592a(6) =11370a(7) =18899a(8) =40776a(9) =88106a(10) =155906a(11) =309795a(12) =670458a(13) =1259060a(14) =2411996a(15) =5101845a(16) =9988886a(17) =18999278a(18) =39063112a(19) =78266591a(20) =150050760a(21) =301477144a(22) =608976908a(23) =1182523707a(24) =2342361446a(25) =4726202066a(26) =9284557350

External references