Number of (n+1)X(4+1) 0..1 arrays with every 2X2 subblock having one or two 1s.
A251322
Number of (n+1)X(4+1) 0..1 arrays with every 2X2 subblock having one or two 1s.
Terms
- a(0) =220a(1) =1982a(2) =17216a(3) =157312a(4) =1405454a(5) =12770802a(6) =114913804a(7) =1040818716a(8) =9388632290a(9) =84916233072a(10) =766719557970
External references
- oeis: A251322