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

A260200

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

Terms

    a(0) =26a(1) =44a(2) =106a(3) =220a(4) =478a(5) =1044a(6) =2274a(7) =4940a(8) =10758a(9) =23412a(10) =50946a(11) =110876a(12) =241302a(13) =525140a(14) =1142866a(15) =2487228a(16) =5412966a(17) =11780276a(18) =25637506a(19) =55795100a(20) =121427318a(21) =264263252a(22) =575118258a(23) =1251634556a(24) =2723942534a(25) =5928138484a(26) =12901456482a(27) =28077545820

External references