Number of length n+3 0..2 arrays with at most one downstep in every 3 consecutive neighbor pairs.

A255102

Number of length n+3 0..2 arrays with at most one downstep in every 3 consecutive neighbor pairs.

Terms

    a(0) =66a(1) =168a(2) =441a(3) =1137a(4) =2907a(5) =7498a(6) =19338a(7) =49698a(8) =127871a(9) =329325a(10) =847491a(11) =2180700a(12) =5613144a(13) =14447250a(14) =37180603a(15) =95692059a(16) =246288681a(17) =633868172a(18) =1631378124a(19) =4198705332a(20) =10806224445a(21) =27811942767a(22) =71579710341a(23) =184225016494

External references