OFFSET
0,2
LINKS
T. D. Noe, Table of n, a(n) for n = 0..1000
FORMULA
a(n) = number of b(i) <= n^2, b() = A001481.
MATHEMATICA
Table[ Length@Union@Flatten@Table[ i^2+j^2, {i, 0, n}, {j, 0, Min[ i, Floor[ Sqrt[ n^2-i^2 ] ] ]} ], {n, 0, 64} ]
CROSSREFS
KEYWORD
nonn,easy,nice
AUTHOR
STATUS
approved