OFFSET
0,3
COMMENTS
a(n) = (2n)!/2^n for n<=4.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..200
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 06 2010
EXTENSIONS
a(0), a(13) from Alois P. Heinz, Jan 14 2016
Terms a(14) and beyond from Andrew Howroyd, May 14 2020
STATUS
approved