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A185009
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Row sums of A051949 (differences of factorial numbers), seen as a triangle.
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2
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0, 5, 45, 351, 2847, 25047, 241047, 2534247, 28984167, 358842087, 4785978087, 68453274087, 1045616538087, 16993016806887, 292825130163687, 5333909818803687, 102415654899123687, 2067588695129523687, 43785455761653171687, 970599475776544179687
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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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a(n)= (n-1)*(n+1)*n! - sum( i!, i=1..n-1)
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MATHEMATICA
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Table[Plus @@ Prepend[Table[(n + 1)! - i!, {i, n, 2, -1}], (n)! - 1], {n, 0, 20}]
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PROG
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(PARI) for(n=1, 25, print1((n^2-1)*n! - sum(k=1, n-1, k!), ", ")) \\ G. C. Greubel, Jun 09 2017
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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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