Number of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock having a single 1 or two 1s on the same edge.
A251252
Number of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock having a single 1 or two 1s on the same edge.
Terms
- a(0) =18a(1) =56a(2) =150a(3) =446a(4) =1232a(5) =3602a(6) =10108a(7) =29272a(8) =82854a(9) =238640a(10) =678658a(11) =1948718a(12) =5556204a(13) =15926754a(14) =45474920a(15) =130227048a(16) =372121034a(17) =1065071288a(18) =3044724350a(19) =8711869630a(20) =24910552504a(21) =71264572098a(22) =203799138404a(23) =582977750488
External references
- oeis: A251252