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 A386688 #8 Jul 30 2025 17:49:11
%S A386688 0,1,9,81,225,1369,2209,13689,106929,915849,8105409,72539289,
%T A386688 651627729,1097530641,1108290681,2176502409,4469591025,21803770921,
%U A386688 26143332721,47825753481,253493117361,396488086929,845198906409,4313600840241,9044785577025,50417568884089,62908961921289
%N A386688 Squares in A386687.
%F A386688 a(n) = A386370(n)^2.
%t A386688 Module[{s = 0, a = 0}, Table[If[IntegerQ[Sqrt[s += a]], a = k; s, Nothing], {k, 10^5}]]
%Y A386688 Cf. A386369, A386370.
%Y A386688 Intersection of A000290 and A386687.
%K A386688 nonn
%O A386688 1,3
%A A386688 _Paolo Xausa_, Jul 29 2025