Number of (n+1)X(3+1) 0..1 arrays with every 2X2 subblock having one or two 1s.
A251321
Number of (n+1)X(3+1) 0..1 arrays with every 2X2 subblock having one or two 1s.
Terms
- a(0) =78a(1) =474a(2) =2804a(3) =17216a(4) =104058a(5) =636404a(6) =3866110a(7) =23591052a(8) =143559096a(9) =875140808a(10) =5328991184a(11) =32472642112a(12) =197786681730
External references
- oeis: A251321