OFFSET
0,3
COMMENTS
A column of number triangle A124816.
FORMULA
a(n)=(1/(2(n+3)))*C(3n/2+3,n/2+1)(1+(-1)^n)+(2/(n+3))*C(3(n+1)/2,(n-1)/2)(1-(-1)^n)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Nov 08 2006
STATUS
approved