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 A261934 #7 Mar 29 2018 16:29:37
%S A261934 7,17,26,52,205,383,544,1010,3755,6949,9838,18200,67457,124771,176612,
%T A261934 326662,1210543,2239001,3169250,5861788,21722389,40177319,56869960,
%U A261934 105185594,389792531,720952813,1020490102,1887478976,6994543241,12936973387,18311951948
%N A261934 The first of ten consecutive positive integers the sum of the squares of which is equal to the sum of the squares of two consecutive positive integers.
%C A261934 For the first of the corresponding two consecutive positive integers, see A261932.
%H A261934 Colin Barker, <a href="/A261934/b261934.txt">Table of n, a(n) for n = 1..1000</a>
%H A261934 <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,0,18,-18,0,0,-1,1).
%F A261934 G.f.: x*(2*x^8+2*x^7+x^6+2*x^5-27*x^4-26*x^3-9*x^2-10*x-7) / ((x-1)*(x^4-4*x^2-1)*(x^4+4*x^2-1)).
%e A261934 7 is in the sequence because 7^2 + 8^2 + ... + 16^2 = 26^2 + 27^2.
%t A261934 LinearRecurrence[{1,0,0,18,-18,0,0,-1,1},{7,17,26,52,205,383,544,1010,3755},40] (* _Harvey P. Dale_, Mar 29 2018 *)
%o A261934 (PARI) Vec(x*(2*x^8+2*x^7+x^6+2*x^5-27*x^4-26*x^3-9*x^2-10*x-7)/((x-1)*(x^4-4*x^2-1)*(x^4+4*x^2-1)) + O(x^40))
%Y A261934 Cf. A001652, A031138, A261932, A261933, A261935.
%K A261934 nonn,easy
%O A261934 1,1
%A A261934 _Colin Barker_, Sep 06 2015