OFFSET
0,3
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..50
Cyril Banderier, Philippe Marchal, and Michael Wallner, Rectangular Young tableaux with local decreases and the density method for uniform random generation (short version), arXiv:1805.09017 [cs.DM], 2018.
FORMULA
a(n) = (9*n)!/(n!*(9!)^n). - Christian G. Bower, Sep 15 1998
MATHEMATICA
Table[Pochhammer[n + 1, 8*n]/9!^n, {n, 0, 10}] (* Paolo Xausa, Aug 08 2024 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
a(0)=1 from Andrew Howroyd, Feb 26 2018
STATUS
approved