Number of permutations of [n] with exactly two (possibly overlapping) occurrences of some of the consecutive step patterns UUD, UDU, DUU (U=up, D=down).
A228408
Number of permutations of [n] with exactly two (possibly overlapping) occurrences of some of the consecutive step patterns UUD, UDU, DUU (U=up, D=down).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =29a(6) =230a(7) =1537a(8) =11208a(9) =89657a(10) =724755a(11) =6010150a(12) =55305521a(13) =545054759a(14) =5504044595a(15) =59482056555a(16) =690974195737
External references
- oeis: A228408