A238127 Number of standard Young tableaux with n cells and exactly two successions.

0, 0, 0, 1, 2, 6, 17, 57, 191, 663, 2415, 9108, 35695, 143989, 599802, 2566917, 11298164, 50967216, 235745644, 1115324000, 5397332497, 26669487517, 134528555379, 691856601631, 3626390958551, 19353306241764, 105122093620388, 580689432523534, 3260906342453966

Offset

0,5

Comments

A succession is a pair of cells (v, v+1) lying in the same row.

Also number of ballot sequences having two flat steps.

Third column (k=2) of A238125.

Links

Table of n, a(n) for n=0..28.

Crossrefs

Cf. A237770 (no successions), A238126 (one succession).

Sequence in context: A161408 A150033 A150034 * A190915 A032132 A339223

Adjacent sequences: A238124 A238125 A238126 * A238128 A238129 A238130

Keyword

nonn

Author

Joerg Arndt and Alois P. Heinz, Feb 21 2014

Status

approved