OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..121
MATHEMATICA
Select[Range[560], Divisible[DivisorSigma[0, (2#)!], DivisorSigma[ 0, #!]]&] (* Harvey P. Dale, Mar 06 2015 *)
PROG
(PARI) isok(n) = (numdiv((2*n)!) % numdiv(n!)) == 0; \\ Michel Marcus, Apr 16 2015
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Sep 28 2002
STATUS
approved