Number of length n+4 0..3 arrays with at most two downsteps in every 4 consecutive neighbor pairs.
A255656
Number of length n+4 0..3 arrays with at most two downsteps in every 4 consecutive neighbor pairs.
Terms
- a(0) =968a(1) =3692a(2) =14192a(3) =54560a(4) =209412a(5) =803246a(6) =3083292a(7) =11835664a(8) =45429680a(9) =174365744a(10) =669261344a(11) =2568836929a(12) =9859943512a(13) =37845226102a(14) =145260624176a(15) =557551963747
External references
- oeis: A255656