OFFSET
1,2
LINKS
Eric M. Schmidt, Table of n, a(n) for n = 1..35
T. Kyle Petersen and Bridget Eileen Tenner, How to write a permutation as a product of involutions (and why you might care), arXiv:1202.5319 [math.CO], 2012.
EXAMPLE
The character table of S_3 is / 1 1 1 / 2 0 -1 / 1 -1 1 / and so a(3)=9.
MAPLE
P:=combinat[partition](n):
add(add(abs(combinat[Chi](l, m)), l in P), m in P);
PROG
(GAP) A214418 := n -> Sum(Irr(CharacterTable("Symmetric", n)), chi -> Sum(chi, x->AbsoluteValue(x))); # Eric M. Schmidt, Jul 18 2012, revised Sep 05 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
Kyle Petersen, Jul 17 2012
STATUS
approved