A243421 Number of Dyck paths of semilength n having exactly 9 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).

1, 21, 279, 2914, 25771, 201454, 1433041, 9469739, 59016909, 350829247, 2006522229, 11114963598, 59942608977, 316006164419, 1633786190804, 8305527032158, 41603804525306, 205707814621939, 1005426524364506, 4863626362504773, 23309223454202475, 110773290856066906

Offset

20,2

Links

Alois P. Heinz, Table of n, a(n) for n = 20..550

Crossrefs

Column k=9 of A243366.

Sequence in context: A225967 A334529 A004324 * A028053 A223996 A323063

Adjacent sequences: A243418 A243419 A243420 * A243422 A243423 A243424

Keyword

nonn

Author

Alois P. Heinz, Jun 04 2014

Status

approved