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A001448
C(4n,2n) = (4*n)!/((2*n)!*(2*n)!).
+0
7
1, 6, 70, 924, 12870, 184756, 2704156, 40116600, 601080390, 9075135300, 137846528820, 2104098963720, 32247603683100, 495918532948104, 7648690600760440, 118264581564861424, 1832624140942590534
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.
AT&T Labs Research
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