Number of length-n 0..4 arrays with no adjacent pair x,x+1 repeated.

A269652

Number of length-n 0..4 arrays with no adjacent pair x,x+1 repeated.

Terms

    a(0) =5a(1) =25a(2) =125a(3) =621a(4) =3065a(5) =15036a(6) =73348a(7) =355921a(8) =1718569a(9) =8259567a(10) =39522507a(11) =188338770a(12) =894017122a(13) =4228223130a(14) =19928007170a(15) =93614937601a(16) =438406639797

External references