A243416 Number of Dyck paths of semilength n having exactly 4 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).

1, 11, 79, 474, 2561, 12937, 62524, 293146, 1344602, 6065734, 27007870, 118984043, 519589872, 2252141576, 9699519424, 41541816291, 177048628294, 751293699026, 3175665502731, 13376228005419, 56162636663430, 235124074987923, 981718571224412, 4088916793922566

Offset

10,2

Links

Alois P. Heinz, Table of n, a(n) for n = 10..550

Crossrefs

Column k=4 of A243366.

Sequence in context: A026841 A026848 A026864 * A101028 A125348 A337929

Adjacent sequences: A243413 A243414 A243415 * A243417 A243418 A243419

Keyword

nonn

Author

Alois P. Heinz, Jun 04 2014

Status

approved