Number of (n+1) X (1+1) 0..1 arrays with every 2 X 2 subblock having one or two 1s.
A251319
Number of (n+1) X (1+1) 0..1 arrays with every 2 X 2 subblock having one or two 1s.
Terms
- a(0) =10a(1) =28a(2) =78a(3) =220a(4) =618a(5) =1740a(6) =4894a(7) =13772a(8) =38746a(9) =109020a(10) =306734a(11) =863036a(12) =2428234a(13) =6832108a(14) =19222846a(15) =54085548a(16) =152175418a(17) =428161788a(18) =1204678734a(19) =3389491996a(20) =9536696618a(21) =26832511756a(22) =75496129374a(23) =212416400780a(24) =597656166170
External references
- oeis: A251319