OFFSET
0,3
COMMENTS
a(n) = (2n)!/2^n for n<=3.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..200
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 06 2010
EXTENSIONS
Terms a(16) and beyond from Andrew Howroyd, May 14 2020
STATUS
approved