OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..351
FORMULA
a(n) = n! * [x^n] exp(n*x)*(exp(n*x) - 1)/(exp(x) - 1). - Ilya Gutkovskiy, Apr 07 2018
EXAMPLE
a(4) = 4^4 +5^4 + 6^4 +7^4 = 4578.
MATHEMATICA
Table[Total[Range[n, 2n-1]^n], {n, 20}] (* Harvey P. Dale, Aug 23 2019 *)
PROG
(PARI) a(n)=sum(k=n, 2*n-1, k^n)
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Jul 16 2004
EXTENSIONS
Extended by Ray Chandler, Jul 17 2004
STATUS
approved