|
| |
|
|
A092470
|
|
a(n)=sum(i+j+k=n,(n+2i)!/(2*i)!/j!/k!) 0<=i<=j<=k<=n.
|
|
0
|
|
|
|
1, 3, 42, 774, 19440, 605520, 22856400, 1012258800, 51590125440, 2974547691360, 191478611348640, 13613255894921760, 1059445820574741600, 89583977589282015840, 8178390058456647469440, 801733426581997672963200
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,2
|
|
|
LINKS
|
Table of n, a(n) for n=0..15.
|
|
|
PROG
|
(PARI) a(n)=sum(i=0, n, sum(j=0, i, sum(k=0, j, if(i+j+k-n, 0, (n+2*i)!/(2*i)!/j!/k!))))
|
|
|
CROSSREFS
|
Sequence in context: A173936 A219619 A097068 * A206820 A157542 A078601
Adjacent sequences: A092467 A092468 A092469 * A092471 A092472 A092473
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
Benoit Cloitre, Mar 25 2004
|
|
|
STATUS
|
approved
|
| |
|
|
