Number of length-n 0..4 arrays with no adjacent pair x,x+1 followed at any distance by x+1,x.
A268453
Number of length-n 0..4 arrays with no adjacent pair x,x+1 followed at any distance by x+1,x.
Terms
- a(0) =5a(1) =25a(2) =121a(3) =581a(4) =2776a(5) =13204a(6) =62535a(7) =294967a(8) =1385969a(9) =6488635a(10) =30273074a(11) =140779986a(12) =652648100a(13) =3016745162a(14) =13905372533a(15) =63924885355a(16) =293126854872
External references
- oeis: A268453