Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 or 00000001.
A259635
Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 or 00000001.
Terms
- a(0) =18a(1) =29a(2) =69a(3) =133a(4) =236a(5) =472a(6) =940a(7) =1781a(8) =3433a(9) =6725a(10) =13008a(11) =25088a(12) =48696a(13) =94445a(14) =182717a(15) =353893a(16) =685924a(17) =1328520a(18) =2572916a(19) =4984581a(20) =9656065a(21) =18703333a(22) =36229992a(23) =70182768a(24) =135948832a(25) =263342141a(26) =510120437a(27) =988149701a(28) =1914124956a(29) =3707828408
External references
- oeis: A259635