Number of length n+4 0..2 arrays with at most one downstep in every 4 consecutive neighbor pairs.

A255103

Number of length n+4 0..2 arrays with at most one downstep in every 4 consecutive neighbor pairs.

Terms

    a(0) =147a(1) =331a(2) =789a(3) =1905a(4) =4429a(5) =10125a(6) =23463a(7) =55246a(8) =129480a(9) =300432a(10) =696375a(11) =1623876a(12) =3795126a(13) =8845445a(14) =20569653a(15) =47880261a(16) =111630444a(17) =260248590a(18) =606129714a(19) =1411326056a(20) =3287784315a(21) =7661560197a(22) =17850285244a(23) =41578206276a(24) =96850762992

External references