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A107864
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Column 2 of triangle A107862; a(n) = C( (n+1)*(n+2)/2 + n-1, n).
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4
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1, 3, 21, 220, 3060, 53130, 1107568, 26978328, 752538150, 23667689815, 828931106355, 32006008361808, 1350990969850340, 61902409203193230, 3060335715568296000, 162392216278033616560, 9206887338937200407418
(list; graph; refs; listen; history; internal format)
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