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 A159405 #12 Feb 22 2024 19:58:28 %S A159405 18,7326,2995908,1455763635,622097389872,206307703531587, %T A159405 47588288640846912,7046841590377578801,653092799056599247740, %U A159405 39121901776525814650965,1603648230996545513760708,47634024309523287458232228,1076943060410127149424142230 %N A159405 Number of n X n arrays of squares of integers summing to 20. %C A159405 All such sequences have holonomic recurrences (cf. comment in A159359). - _Georg Fischer_, Feb 17 2022 %H A159405 R. H. Hardin, <a href="/A159405/b159405.txt">Table of n, a(n) for n = 2..100</a> %H A159405 Vaclav Kotesovec, <a href="/A159405/a159405.txt">G.f. for A159405</a> %H A159405 <a href="/index/Rec#order_41">Index entries for linear recurrences with constant coefficients</a>, signature (41, -820, 10660, -101270, 749398, -4496388, 22481940, -95548245, 350343565, -1121099408, 3159461968, -7898654920, 17620076360, -35240152720, 63432274896, -103077446706, 151584480450, -202112640600, 244662670200, -269128937220, 269128937220, -244662670200, 202112640600, -151584480450, 103077446706, -63432274896, 35240152720, -17620076360, 7898654920, -3159461968, 1121099408, -350343565, 95548245, -22481940, 4496388, -749398, 101270, -10660, 820, -41, 1). %F A159405 G.f.: see link above. - _Vaclav Kotesovec_, Dec 04 2012 %K A159405 nonn %O A159405 2,1 %A A159405 _R. H. Hardin_, Apr 11 2009