OFFSET
1,3
EXAMPLE
a(1)=a(2)=(2/2)=1: 2 solutions (-1,1),(1,-1);
a(3)=(8/2)=4: 2 solutions for n<3 and the 6 solutions (1,1), (-1,-1), (1,-2), (2,-1), (-1,2), (-2,1);
a(4)=a(5)=a(6)=10/2=5: 8 solutions for n<6 and the 2 solutions (-2,2), (2,-2).
CROSSREFS
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Mar 25 2019
STATUS
approved