Number of length n+4 0..3 arrays with at most one downstep in every 4 consecutive neighbor pairs.
A258726
Number of length n+4 0..3 arrays with at most one downstep in every 4 consecutive neighbor pairs.
Terms
- a(0) =512a(1) =1408a(2) =4184a(3) =12549a(4) =35540a(5) =98676a(6) =281136a(7) =819453a(8) =2358888a(9) =6678576a(10) =18944656a(11) =54386801a(12) =156395364a(13) =446683118a(14) =1271579860a(15) =3632749828a(16) =10409795664a(17) =29790138680a(18) =85049570304a(19) =242860722210a(20) =694569186912
External references
- oeis: A258726