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A094590
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a(1) = 1; a(n+1) = a(n) * k(n), where k(n) is the number of elements of {a(j)}, 1<=j<=n, which are <= n.
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1
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1, 1, 2, 6, 18, 54, 216, 864, 3456, 13824, 55296, 221184, 884736, 3538944, 14155776, 56623104, 226492416, 905969664, 4529848320, 22649241600, 113246208000, 566231040000, 2831155200000, 14155776000000, 70778880000000
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