OFFSET
7,2
LINKS
Eric Weisstein's World of Mathematics, Minimal cover
FORMULA
a(n) = (1/7!) * (127^n - 7 * 126^n + 21 * 125^n - 35 * 124^n + 35 * 123^n - 21 * 122^n + 7 * 121^n - 120^n).
G.f.: x^7 / ((120*x-1)*(121*x-1)*(122*x-1)*(123*x-1)*(124*x-1)*(125*x-1)*(126*x-1)*(127*x-1)). - Colin Barker, Jul 11 2013
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Vladeta Jovovic, Oct 16 2000
EXTENSIONS
Additional term from Colin Barker, Jul 11 2013
STATUS
approved