OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..10000
FORMULA
a(n) = (n-1)*n^2*(n^3 + n^2 + 1)/2.
EXAMPLE
a(3) = T(3^3) - T(3^2) = T(27) - T(9) = 378 - 45 = 333.
PROG
(PARI) t(n)=n*(n+1)/2; for(n=0, 50, print1(t(n^3)-t(n^2)", "))
(Magma) [(n-1)*n^2*(n^3+n^2+1)/2: n in [0..40]]; // Vincenzo Librandi, Sep 14 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Jon Perry, Jul 21 2003
STATUS
approved