Number of walks of length 2n between two nodes at distance 2 in the cycle graph C_10.

A095930

Number of walks of length 2n between two nodes at distance 2 in the cycle graph C_10.

Terms

    a(0) =1a(1) =4a(2) =15a(3) =57a(4) =220a(5) =859a(6) =3381a(7) =13380a(8) =53143a(9) =211585a(10) =843756a(11) =3368259a(12) =13455325a(13) =53774932a(14) =214978335a(15) =859595529a(16) =3437550076a(17) =13748021995a(18) =54986385093a(19) =219930610020a(20) =879683351911

External references