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A080474
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a(n)= product of sum of taking (n-1) numbers from the next n numbers. The next n numbers can be grouped like this (1), (2,3), (4,5,6), (7,8,9,10),... . Let N be the sum of all the members of the n-th group. Let k be a member and f(k) = N - k. Then a(n) = the product of all f(k) for k taking all member values.
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1
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1, 6, 990, 421200, 379501200, 625757605200, 1707530790369600, 7172573016426048000, 43928207579534870592000, 376055676152225153019936000, 4350748615258091511751558272000
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