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A052203
a(n)=(4n+1)*binomial(4n,n)/(3n+1).
+0
6
1, 5, 36, 286, 2380, 20349, 177100, 1560780, 13884156, 124403620, 1121099408, 10150595910, 92263734836, 841392966470, 7694644696200, 70539987842520, 648045936942300, 5964720367660956, 54991682779774384, 507749884105448600
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Maintained by
N. J. A. Sloane
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
AT&T Labs Research
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