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A076128 Difference between the product of numbers up to n and the sum of numbers up to n. 0

%I

%S 0,-1,0,14,105,699,5012,40284,362835,3628745,39916734,479001522,

%T 6227020709,87178291095,1307674367880,20922789887864,355687428095847,

%U 6402373705727829,121645100408831810,2432902008176639790

%N Difference between the product of numbers up to n and the sum of numbers up to n.

%F a(n) = n!- n*(n+1)/2

%t Table[n! - n(n + 1)/2, {n, 0, 20}]

%K easy,sign

%O 1,4

%A Emrehan Halici (emrehan(AT)halici.com.tr), Oct 31 2002

%E Edited by _Robert G. Wilson v_, Oct 31 2002

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Last modified August 19 22:59 EDT 2022. Contains 356231 sequences. (Running on oeis4.)