A048150 - OEIS

%I #4 Mar 30 2012 18:56:54

%S 1,4,9,20,31,48,65,86,113,140,173,206,239,286,327,378,425,478,533,590,

%T 659,722,793,862,933,1020,1099,1184,1271,1360,1455,1550,1655,1758,

%U 1865,1976,2079,2202,2319,2448,2569,2694,2827,2960

%N a(n)=number of numbers h^2+k^2 that are <=2n^2; equivalently, a(n)=T(n,n), array T as in A048149.

%K nonn

%O 0,2

%A _Clark Kimberling_