OFFSET
1,3
COMMENTS
log(a(n)) ~ 1/2 log n!.
LINKS
P. Pollack, Analytic and Combinatorial Number Theory Course Notes, p. 75. [?Broken link]
P. Pollack, Analytic and Combinatorial Number Theory Course Notes, p. 75.
PROG
(PARI) a(n)=local(f); f=factor(n!); prod(k=1, matsize(f)[1], if(f[k, 1]%4<>3, 1, f[k, 1]^f[k, 2]))
CROSSREFS
KEYWORD
nonn
AUTHOR
Ralf Stephan, Aug 30 2004
EXTENSIONS
Typo in PARI code fixed by Colin Barker, Mar 12 2015
STATUS
approved