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A006335 4^n*(3*n)!/((n+1)!*(2*n+1)!).
(Formerly M2094) 		+0
6
1, 2, 16, 192, 2816, 46592, 835584, 15876096, 315031552, 6466437120, 136383037440, 2941129850880, 64614360416256, 1442028424527872, 32619677465182208, 746569714888605696, 17262927525017812992, 402801642250415636480, 9474719710174783733760, 224477974671833337692160 (list; graph; listen)
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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

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