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Search: id:A086828
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| A086828 |
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a(1) = 0, a(2) = 1, a(3) = 1, a(4) = 7; thereafter, a(n) = a(n-1) + (n-1)*a(n-2). |
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| 0, 1, 1, 7, 11, 46, 112, 434, 1330, 5236, 18536, 76132, 298564, 1288280, 5468176, 24792376, 112283192, 533753584, 2554851040, 12696169136, 63793189936, 330412741792, 1733862920384, 9333355981600, 50946066070816
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