Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 or 00000001.
A259636
Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 or 00000001.
Terms
- a(0) =29a(1) =64a(2) =171a(3) =365a(4) =813a(5) =1964a(6) =4499a(7) =10188a(8) =23712a(9) =54825a(10) =125645a(11) =289829a(12) =669250a(13) =1540429a(14) =3548858a(15) =8183956a(16) =18857787a(17) =43449225a(18) =100146613a(19) =230800868a(20) =531852951a(21) =1225710880a(22) =2824793748a(23) =6509782737a(24) =15002141393a(25) =34573642293a(26) =79676799626
External references
- oeis: A259636