Number of length n+3 0..3 arrays with at most two downsteps in every n consecutive neighbor pairs.

A255663

Number of length n+3 0..3 arrays with at most two downsteps in every n consecutive neighbor pairs.

Terms

    a(0) =256a(1) =1024a(2) =4048a(3) =14192a(4) =42653a(5) =112196a(6) =265430a(7) =577464a(8) =1174730a(9) =2262312a(10) =4162792a(11) =7370432a(12) =12625472a(13) =21014456a(14) =34103820a(15) =54115508a(16) =84155145a(17) =128505312a(18) =192998760a(19) =285488992a(20) =416438559a(21) =599648684a(22) =853157474a(23) =1200338032a(24) =1671232268

External references