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A176315
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Partials sums of A007080.
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0
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1, 3, 13, 165, 7901, 1383853, 879285501, 2047199658621, 17660268902020093, 569790880105867285245, 69280640454268889757533693
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OFFSET
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1,2
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COMMENTS
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Partials sums of number of labeled Eulerian digraphs with n nodes. The subsequence of primes in this partial sum begins: 3, 13, 7901, 1383853, 17660268902020093.
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LINKS
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FORMULA
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EXAMPLE
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a(5) = 1 + 2 + 10 + 152 + 7736 = 7901 is prime.
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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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