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 A359991 #8 Jan 28 2023 22:07:28 %S A359991 1,105,7857,555195,38757695,2698167665,187715481077,13057666054455, %T A359991 908271228919067,63177423571626685,4394479113198329137, %U A359991 305669914361091938915,21261697652022553831895,1478914849135091196256585,102869919107895518546358701 %N A359991 Number of connected spanning subgraphs in the 4 X n grid graph. %H A359991 Andrew Howroyd, <a href="/A359991/b359991.txt">Table of n, a(n) for n = 1..200</a> %H A359991 <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (105,-2907,33255,-183316,519800,-778624,610800,-237312,39680,-2048). %F A359991 G.f.: x*(1 - 261*x^2 + 2190*x^3 - 5940*x^4 + 5400*x^5 - 672*x^6 - 960*x^7 + 256*x^8)/(1 - 105*x + 2907*x^2 - 33255*x^3 + 183316*x^4 - 519800*x^5 + 778624*x^6 - 610800*x^7 + 237312*x^8 - 39680*x^9 + 2048*x^10). %Y A359991 Row 4 of A359993. %K A359991 nonn,easy %O A359991 1,2 %A A359991 _Andrew Howroyd_, Jan 28 2023