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 A322757 #15 Aug 08 2025 03:27:07 %S A322757 1,4,5,7,8,0,4,5,2,0,1,5,4,0,9,3,9,0,0,6,9,1,9,2,2,2,8,2,3,4,1,9,7,4, %T A322757 5,9,4,3,2,0,3,3,0,7,6,9,9,2,9,1,8,6,3,5,1,3,0,5,0,0,7,8,4,5,5,5,8,7, %U A322757 3,8,1,8,4,3,9,2 %N A322757 Decimal expansion of G/(2*Pi), where G is Catalan's constant A006752. %C A322757 Per-site entropy of the dimer model on a square grid. %D A322757 Miklos Bona, editor, Handbook of Enumerative Combinatorics, CRC Press, 2015, page 554. %F A322757 Equals (1/2) * A143233. - _Peter Bala_, Aug 01 2025 %e A322757 0.1457804520154093900691922282341974594320330769929186351305007845558738184... %t A322757 RealDigits[Catalan/(2*Pi), 10, 120][[1]] (* _Amiram Eldar_, May 24 2023 *) %Y A322757 Cf. A006752, A019692, A143233. %K A322757 nonn,cons %O A322757 0,2 %A A322757 _N. J. A. Sloane_, Dec 28 2018