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A121954
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a(0)=0, a(1)=1, a(n) = (n+1)*a(n-1) + a(n-2) for n>=2.
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0
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0, 1, 3, 13, 68, 420, 3015, 24541, 223884, 2263381, 25121075, 303716281, 3973432728, 55931774473, 842950049823, 13543132571641, 231076203767720, 4172914800390601, 79516457411189152, 1594502063024173568
(list; graph; refs; listen; history; internal format)
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