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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

Table of n, a(n) for n=0..13.

FORMULA

a(n)=sum{k=0..floor(n/2), (2(n-k))!/(2k)!}

CROSSREFS

Sequence in context: A121252 A090733 A197084 * A059363 A216661 A273545

Adjacent sequences:  A119826 A119827 A119828 * A119830 A119831 A119832

KEYWORD

easy,nonn

AUTHOR

Paul Barry, May 25 2006

STATUS

approved

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Last modified December 9 00:45 EST 2016. Contains 278959 sequences.