OFFSET
0,3
COMMENTS
This is the rectangular array A(3;m,n) := (2*n+m)!!/m!!, m >= 0, n >= 0, read by SW-NE diagonals. For n!! see A006882 (double factorials).
LINKS
W. Lang, First 9 rows.
FORMULA
a(m, n)=(n+m)!!/(m-n)!!, 0<=n<=m, else 0, with 0!! := 1.
CROSSREFS
KEYWORD
AUTHOR
Wolfdieter Lang, Mar 19 2004
STATUS
approved