This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A337134 #6 Aug 22 2020 12:40:29
%S A337134 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 A337134 107,114,121,128,135,142,149,156,164,172,180,188,196,204,212,220,229,
%U A337134 238,247,256,265,274,283,292,301,310,320,330,340,350,360,370,380,390,400,410,421,432
%N A337134 a(n) = Sum_{k=1..n} floor(sqrt(2k-1)).
%C A337134 Partial sums of A103128.
%t A337134 Table[Sum[Floor[Sqrt[2 i - 1]], {i, n}], {n, 100}]
%o A337134 (PARI) a(n) = sum(k=1, n, sqrtint(2*k-1)); \\ _Michel Marcus_, Aug 18 2020
%Y A337134 Cf. A103128.
%K A337134 nonn,easy
%O A337134 1,2
%A A337134 _Wesley Ivan Hurt_, Aug 18 2020