OFFSET
1,2
LINKS
Daniel Suteu, Table of n, a(n) for n = 1..100
Wikipedia, Liouville function.
FORMULA
Limit_{n->infinity} a(n)/(n!)^2 = zeta(4)/zeta(2) = Pi^2/15.
MATHEMATICA
Table[(n!)^2 * Sum[(-1)^PrimeOmega[k]/k^2, {k, n}], {n, 20}] (* Indranil Ghosh, Apr 13 2017 *)
PROG
(PARI) a(n) = (n!)^2 * sum(k=1, n, (-1)^bigomega(k)/k^2);
CROSSREFS
KEYWORD
nonn
AUTHOR
Daniel Suteu, Apr 12 2017
STATUS
approved