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A367255
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a(n) = (n + 1)^(n - 2)*(3*n + 1).
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1
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1, 2, 7, 40, 325, 3456, 45619, 720896, 13286025, 280000000, 6645125311, 175432531968, 5100764198413, 161982606786560, 5579092529296875, 207165582859042816, 8250513501410645521, 350825312056827838464, 15864277746219164222455, 760217600000000000000000
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = Sum_{k=0..n} binomial(n - 1, k - 1) * n^(n - k) * (k + 1). (See A137452.)
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MAPLE
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a := n -> (n + 1)^(n - 2)*(3*n + 1): seq(a(n), n = 0..19);
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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