Number of (n+1) X (3+1) 0..1 arrays with every 2 X 2 subblock having a single 1 or two 1s on the same edge.
A251253
Number of (n+1) X (3+1) 0..1 arrays with every 2 X 2 subblock having a single 1 or two 1s on the same edge.
Terms
- a(0) =38a(1) =150a(2) =464a(3) =1770a(4) =5680a(5) =21088a(6) =69270a(7) =252226a(8) =842160a(9) =3024532a(10) =10215894a(11) =36333498a(12) =123729784a(13) =437028516a(14) =1496890470a(15) =5261453226a(16) =18095303560a(17) =63384222948a(18) =218626027574a(19) =763932706666
External references
- oeis: A251253