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A107874
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Column 0 of triangle A107873; a(n) = C( n*(n-1)/2 + n+3, n).
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2
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1, 4, 15, 84, 715, 8568, 134596, 2629575, 61523748, 1677106640, 52179482355, 1823810410032, 70724320184700, 3012192716517082, 139737927523546800, 7012067478708989884, 378371310857796292200, 21843987843214746108900
(list; graph; refs; listen; history; internal format)
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