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A072343 a(n) = 2^(n-1)*sum(k=0,n,(n+k)!/k!^2). 0
3, 28, 320, 4272, 65632, 1149312, 22712832, 501216000, 12225264128, 326574262272, 9478749110272, 296914161754112, 9979741990993920, 358151267772203008, 13664955628675399680, 552220995731872481280 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..16.

CROSSREFS

Sequence in context: A199754 A277507 A176335 * A292845 A212032 A352383

Adjacent sequences:  A072340 A072341 A072342 * A072344 A072345 A072346

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Jul 31 2002

STATUS

approved

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Last modified October 1 13:55 EDT 2022. Contains 357149 sequences. (Running on oeis4.)