|
| |
|
|
A119829
|
|
Diagonal sum of number triangle A119828.
|
|
1
|
|
|
|
1, 2, 25, 732, 40681, 3648990, 480817681, 87417943256, 20966398997041, 6412838733766170, 2436104066933508841, 1125217445576328664692, 621010503476937955204825, 403601732164215102065708342
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,2
|
|
|
LINKS
|
|
|
|
FORMULA
|
a(n)=sum{k=0..floor(n/2), (2(n-k))!/(2k)!}
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
easy,nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
