OFFSET
1,3
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..386
FORMULA
E.g.f.: (-1/2)*(lambertW(-x)/(1 + lambertW(-x)) + x*(x+1)*exp(x)). - G. C. Greubel, Jan 08 2024
EXAMPLE
a(3) = (27 - 9)/2 = 9.
MAPLE
MATHEMATICA
Table[(n^n-n^2)/2, {n, 30}] (* Harvey P. Dale, Dec 25 2022 *)
PROG
(Python)
for n in range(1, 22):
print (n**n - n*n)/2,
(Magma) [(n^n -n^2)/2: n in [1..30]]; // G. C. Greubel, Jan 08 2024
(SageMath) [(n^n -n^2)/2 for n in range(1, 31)] # G. C. Greubel, Jan 08 2024
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alex Ratushnyak, Jul 26 2012
STATUS
approved