OFFSET
0,3
COMMENTS
(a,b)+(x,y)=(a+x,b+y); unit is (0,0).
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..99
FORMULA
a(n) = A091438(2n,n). - Alois P. Heinz, Sep 24 2018
EXAMPLE
(2,2)=(1,2)+(1,0)=(1,1)+(1,1), so a(2)=3.
CROSSREFS
KEYWORD
nonn
AUTHOR
Christian G. Bower, Jun 03 2005
STATUS
approved