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 A347677 #24 Aug 20 2022 10:06:47 %S A347677 1,8,26,55,96,149,214,291,380,481,594,719,856,1005,1166,1339,1524, %T A347677 1721,1930,2151,2384,2629,2886,3155,3436,3729,4034,4351,4680,5021, %U A347677 5374,5739,6116,6505,6906,7319,7744,8181,8630,9091,9564,10049,10546,11055,11576,12109 %N A347677 Number of Baxter matrices of size 3 X n that contain n+2 1's. %C A347677 Row 3 of array A347676. %H A347677 Michael S. Branicky, <a href="/A347677/b347677.txt">Table of n, a(n) for n = 1..65</a> %H A347677 George Spahn, <a href="https://arxiv.org/abs/2110.09688">Counting Baxter Matrices</a>, arXiv:2110.09688 [math.CO], 2021. %H A347677 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1) %F A347677 a(n) = 6*n^2 - 13*n + 11 for n >= 3. - _George Spahn_, Oct 20 2021 %F A347677 g.f.: x+8*x^2 -x^3 *(26-23*x+9*x^2)/(x-1)^3 . - _R. J. Mathar_, Aug 20 2022 %Y A347677 Cf. A347676, A347673. %K A347677 nonn,easy %O A347677 1,2 %A A347677 _N. J. A. Sloane_, Sep 10 2021 %E A347677 a(8)-a(46) from _Michael S. Branicky_, Sep 13 2021