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A122021
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a(0) = 0, a(1) = 1, a(2) = 2; for n > 2, a(n) = a(n - 2) - (n - 1)*a(n - 3).
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3
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0, 1, 2, 1, -1, -7, -6, -1, 43, 47, 52, -383, -465, -1007, 4514, 5503, 19619, -66721, -73932, -419863, 1193767, 1058777, 10010890, -25204097, -14340981, -265465457, 615761444, 107400049, 7783328783, -17133920383, 4668727362
(list; graph; refs; listen; history; internal format)
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