|
| |
|
|
A117253
|
|
Column 0 of triangle A117252.
|
|
1
|
|
|
|
1, 1, -3, 45, -2430, 433026, -245525742, 434685788658, -2376644549487615, 39849199161258840705, -2039314646436750180150939, 317469566015078743658568283029, -149970083228995077874358388356635368, 214577598849654850870918566871719460091160
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,3
|
|
|
LINKS
|
|
|
|
FORMULA
|
a(n) = [Product_{j=0..n-1} (1-3*j)]/n! * 3^(n*(n-1)/2).
|
|
|
PROG
|
(PARI) a(n)=prod(j=0, n-1, 1-3*j)/n!*3^(n*(n-1)/2)
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
sign
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
