OFFSET
1,1
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = floor(1/2880 n (1 + n) (2 + n) (53848 + 26922 n + 5165 n^2 + 450 n^3 + 15 n^4)/(8 + n)). - Ivan Neretin, May 17 2018
EXAMPLE
For n=2, the 4th elementary symmetric function of (3,4,5,6,7) is 3*4*5*6 + 3*4*5*7 + 3*4*6*7 + 3*5*6*7 + 4*5*6*7 = 2754, and 2754/(3+4+5+6+7) = 110.16, so a(2) = 110. - Michael B. Porter, May 05 2018
MATHEMATICA
Table[Floor[1/2880 x (1 + x) (2 + x) (53848 + 26922 x + 5165 x^2 + 450 x^3 + 15 x^4)/(8 + x)], {x, 33}] (* Ivan Neretin, May 02 2018 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved