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 A159397 #12 Jun 02 2025 01:34:48 %S A159397 5,3987,960197,243293450,49328395731,7138321890616,666179701320556, %T A159397 38558976229027926,1439078695947198175,37055970405356439240, %U A159397 701629710103618241661,10289171538319337074541,121736692023067368010505 %N A159397 Number of n X n arrays of squares of integers summing to 16. %C A159397 All such sequences have holonomic recurrences (cf. comment in A159359). - _Georg Fischer_, Feb 17 2022 %H A159397 R. H. Hardin, <a href="/A159397/b159397.txt">Table of n, a(n) for n=2..100</a> %H A159397 <a href="/index/Rec#order_33">Index entries for linear recurrences with constant coefficients</a>, signature (33, -528, 5456, -40920, 237336, -1107568, 4272048, -13884156, 38567100, -92561040, 193536720, -354817320, 573166440, -818809200, 1037158320, -1166803110, 1166803110, -1037158320, 818809200, -573166440, 354817320, -193536720, 92561040, -38567100, 13884156, -4272048, 1107568, -237336, 40920, -5456, 528, -33, 1). %F A159397 Empirical G.f.: -x - x*(1+x)*(1 -29*x + 4379*x^2 + 821431*x^3 + 212904294*x^4 + 41572005795*x^5 + 5592296001394*x^6 + 449779113080002*x^7 + 19634897290562828*x^8 + 461755603301498981*x^9 + 6109738979241997636*x^10 + 47748225885297619913*x^11 + 229005554540179223339*x^12 + 691824816742731558421*x^13 + 1336833271423720702097*x^14 + 1664132445913632199036*x^15 + 1336833271423720702097*x^16 + 691824816742731558421*x^17 + 229005554540179223339*x^18 + 47748225885297619913*x^19 + 6109738979241997636*x^20 + 461755603301498981*x^21 + 19634897290562828*x^22 + 449779113080002*x^23 + 5592296001394*x^24 + 41572005795*x^25 + 212904294*x^26 + 821431*x^27 + 4379*x^28 - 29*x^29 + x^30)/(-1+x)^33. - _Vaclav Kotesovec_, Nov 30 2012 %K A159397 nonn %O A159397 2,1 %A A159397 _R. H. Hardin_ Apr 11 2009