Number of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock having one or two 1s.
A251320
Number of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock having one or two 1s.
Terms
- a(0) =28a(1) =116a(2) =474a(3) =1982a(4) =8218a(5) =34288a(6) =142600a(7) =594236a(8) =2473510a(9) =10302766a(10) =42897286a(11) =178649320a(12) =743905252a(13) =3097889852a(14) =12900178658a(15) =53720031766a(16) =223702349874a(17) =931554901848
External references
- oeis: A251320