login
A119829
Diagonal sum of number triangle A119828.
1
1, 2, 25, 732, 40681, 3648990, 480817681, 87417943256, 20966398997041, 6412838733766170, 2436104066933508841, 1125217445576328664692, 621010503476937955204825, 403601732164215102065708342
OFFSET
0,2
FORMULA
a(n)=sum{k=0..floor(n/2), (2(n-k))!/(2k)!}
MATHEMATICA
Table[Sum[(2(n-k))!/(2k)!, {k, 0, Floor[n/2]}], {n, 0, 20}] (* Harvey P. Dale, Aug 26 2024 *)
CROSSREFS
Sequence in context: A197084 A366038 A337153 * A059363 A216661 A301616
KEYWORD
easy,nonn
AUTHOR
Paul Barry, May 25 2006
STATUS
approved