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A072343
a(n) = 2^(n-1)*sum(k=0,n,(n+k)!/k!^2).
+0
1
3, 28, 320, 4272, 65632, 1149312, 22712832, 501216000, 12225264128, 326574262272, 9478749110272, 296914161754112, 9979741990993920, 358151267772203008, 13664955628675399680, 552220995731872481280
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.
AT&T Labs Research
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