A244198 Number of ballot sequences of length n having largest descent 2.

1, 5, 21, 78, 292, 1028, 3691, 13004, 46452, 165098, 595386, 2148830, 7861261, 28880866, 107407411, 401862116, 1520528499, 5791624015, 22288596981, 86362655462, 337798945830, 1330195410257, 5283145735982, 21119637660235, 85089563602538, 344934335418331

Offset

4,2

Comments

Also number of ballot sequences of length n having largest ascent 2.

Links

Table of n, a(n) for n=4..29.

Crossrefs

Column k=2 of A238128 and of A238129.

Sequence in context: A055219 A108863 A027172 * A186244 A255447 A029870

Adjacent sequences: A244195 A244196 A244197 * A244199 A244200 A244201

Keyword

nonn

Author

Joerg Arndt and Alois P. Heinz, Jun 22 2014

Status

approved