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A305739
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a(n) = n!*T(n) - 1, where T(n) is the n-th triangular number.
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0
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0, 5, 35, 239, 1799, 15119, 141119, 1451519, 16329599, 199583999, 2634508799, 37362124799, 566658892799, 9153720575999, 156920924159999, 2845499424767999, 54420176498687999, 1094805903679487999, 23112569077678079999, 510909421717094399999
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OFFSET
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1,2
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LINKS
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FORMULA
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MAPLE
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seq(n*(n+1)!/2-1, n=1..21);
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PROG
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CROSSREFS
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See A305738 for the indices of primes in this sequence.
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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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