%I
%S 1,2,4,6,9,12,15,18,22,26,30,34,39,44,49,54,59,64,70,76,82,88,94,100,
%T 107,114,121,128,135,142,149,156,164,172,180,188,196,204,212,220,229,
%U 238,247,256,265,274,283,292,301,310,320,330,340,350,360,370,380,390,400,410,421,432
%N a(n) = Sum_{k=1..n} floor(sqrt(2k1)).
%C Partial sums of A103128.
%t Table[Sum[Floor[Sqrt[2 i  1]], {i, n}], {n, 100}]
%o (PARI) a(n) = sum(k=1, n, sqrtint(2*k1)); \\ _Michel Marcus_, Aug 18 2020
%Y Cf. A103128.
%K nonn,easy
%O 1,2
%A _Wesley Ivan Hurt_, Aug 18 2020
