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 A246773 #15 Jan 17 2020 16:07:15 %S A246773 3,2,0,5,5,6,9,4,3,0,4,0,0,5,9,0,3,1,1,7,0,2,0,2,8,6,1,7,7,8,3,8,2,3, %T A246773 4,2,6,3,7,7,1,0,8,9,1,9,5,9,7,6,9,9,4,4,0,4,7,0,5,5,2,2,0,3,5,5,1,8, %U A246773 3,4,7,9,0,3,5,9,1,6,7,4,6,9,1,7,6,4,1,8,2,6,9,5,7,8,0,5,2,5,0,7,8,4,9,9 %N A246773 Decimal expansion of 'v', an auxiliary constant associated with the asymptotic number of row-convex polyominoes. %C A246773 Essentially the same digit sequence as A137421. - _R. J. Mathar_, Sep 06 2014 %H A246773 Steven R. Finch, <a href="http://arxiv.org/abs/2001.00578">Errata and Addenda to Mathematical Constants.</a> p. 48. %F A246773 v = first root of x^3 - 5*x^2 + 7*x - 4 = (x-2)^3+(x-2)^2-(x-2)-2. %F A246773 A001169(n) ~ u*v^n, where u = A246772. %e A246773 3.20556943040059031170202861778382342637710891959769944... %t A246773 v = Root[x^3 - 5*x^2 + 7*x - 4, x, 1]; RealDigits[v, 10, 104] // First %Y A246773 Cf. A001169, A006958, A067675, A246772. %K A246773 nonn,cons,easy %O A246773 1,1 %A A246773 _Jean-François Alcover_, Sep 03 2014