OFFSET
0,2
COMMENTS
The range of the two triangular numbers and the square is the nonnegative numbers.
EXAMPLE
a(0)=1 because there is one representation 0 = T(0)+T(0)+0^2.
a(1)=2 because there are 2 representations 1 = T(0)+T(0)+1^2 = T(0)+T(1)+0^2.
a(4)=3 because there are 3 representations 4 = T(0)+T(0)+2^2 = T(0)+T(2)+1^2 = T(1)+T(2)+0^2.
MAPLE
CROSSREFS
KEYWORD
nonn
AUTHOR
R. J. Mathar, Apr 28 2020
STATUS
approved