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A214647
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a(n) = (n^n + n^2)/2.
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3
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1, 4, 18, 136, 1575, 23346, 411796, 8388640, 193710285, 5000000050, 142655835366, 4458050224200, 151437553296211, 5556003412779106, 218946945190429800, 9223372036854775936, 413620130943168382233, 19673204037648268787874, 989209827830156794562170, 52428800000000000000000200
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OFFSET
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1,2
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LINKS
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EXAMPLE
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a(3) = (3^3 + 3^2)/2 = (27+9)/2 = 18.
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MATHEMATICA
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PROG
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(Python) print([int((n**n+n**2)/2) for n in range(1, 20)])
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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