OFFSET
1,1
FORMULA
a(n) = Sum_{d} |{g element of A_n(4): order(g)=d}| / phi(d), where phi is the Euler totient function. - Sean A. Irvine, Aug 07 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Ahmed Fares (ahmedfares(AT)my-deja.com), Jul 02 2001
EXTENSIONS
More terms from Vladeta Jovovic, Jul 05 2001
More terms from Sean A. Irvine, Aug 07 2022
STATUS
approved