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A241785 Number of standard Young tableaux with 2n cells and exactly n successions. 1
1, 1, 2, 9, 49, 322, 2411, 19868, 178832, 1724689, 17728545, 192634930, 2201760840, 26341552085, 328644606302, 4261866683006, 57288746422850, 796337785825197, 11422744246417607, 168765251734898485, 2564015637845130072, 39998356172536082076, 639840751503820832346 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

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

Also number of ballot sequences of length 2n having exactly n flat steps.

LINKS

Table of n, a(n) for n=0..22.

FORMULA

a(n) = A238125(2n,n).

CROSSREFS

Sequence in context: A295944 A224140 A000167 * A109323 A014372 A185335

Adjacent sequences:  A241782 A241783 A241784 * A241786 A241787 A241788

KEYWORD

nonn

AUTHOR

Joerg Arndt and Alois P. Heinz, Apr 28 2014

STATUS

approved

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Last modified March 22 01:06 EDT 2019. Contains 321406 sequences. (Running on oeis4.)