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 A145431 #7 Aug 23 2024 03:53:39
%S A145431 4,9,9,0,3,8,4,6,0,4,3,6,2,1,2,4,9,4,9,9,2,5,4,5,4,2,1,0,6,8,5,4,2,6,
%T A145431 2,2,4,5,5,5,8,1,3,6,0,9,3,6,8,6,7,6,5,7,5,2,1,1,9,9,3,6,4,4,6,7,5,5,
%U A145431 6,9,3,2,5,9,6,7,2,8,6,2,6,4,1,0,6,4,8,4,5,5,7,1,3
%N A145431 Decimal expansion of Sum_{n>=1} n^3/binomial(2n,n).
%D A145431 Alexander Apelblat, Tables of Integrals and Series, Harri Deutsch, 1996, 4.1.37.
%F A145431 Equals (2/243)*(405+37*Pi*sqrt(3)).
%e A145431 4.990384604362124...
%p A145431 10/3+74/243*Pi*3^(1/2);
%t A145431 RealDigits[2*(405+37*Pi*Sqrt[3])/243, 10, 120][[1]] (* _Amiram Eldar_, Aug 23 2024 *)
%Y A145431 Cf. A000984, A304656.
%K A145431 cons,easy,nonn
%O A145431 1,1
%A A145431 _R. J. Mathar_, Feb 08 2009