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 A340662 #5 Jan 18 2021 18:36:42 %S A340662 4,49,196,484,1681,4900,12100,19600,32761,73984,148225,175561,328329, %T A340662 492804,753424,1258884,1860496,2405601,3374569,4330561,5929225, %U A340662 8363664,11088900,13823524,18190225,23639044,28933641,36264484,43612816,53582400,67914081,81180100,97970404 %N A340662 a(n) is the end of the first occurrence of n consecutive perfect powers, all of which are squares with exponents equal to 2 (A111245). %F A340662 a(n) = A340664(n)^2 = A340663(n)^2 + (n - 1)*(2*A340663(n) + n - 1). %e A340662 See A340661. %Y A340662 Cf. A000290, A001597, A111245, A340661, A340663, A340664, A340695. %K A340662 nonn %O A340662 1,1 %A A340662 _Hugo Pfoertner_, Jan 18 2021