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 A269430 #21 Oct 01 2022 15:34:34
%S A269430 2,0,7,0,7,9,6,3,2,6,7,9,4,8,9,6,6,1,9,2,3,1,3,2,1,6,9,1,6,3,9,7,5,1,
%T A269430 4,4,2,0,9,8,5,8,4,6,9,9,6,8,7,5,5,2,9,1,0,4,8,7,4,7,2,2,9,6,1,5,3,9,
%U A269430 0,8,2,0,3,1,4,3,1,0,4,4,9,9,3,1,4,0,1,7,4,1,2,6,7,1,0,5,8,5,3,3,9
%N A269430 Decimal expansion of (1 + Pi)/2.
%H A269430 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F A269430 Equals A096444 + 1 or A019669 + 1/2.
%F A269430 Equals Sum_{k>=0} 2^k/binomial(2*k+2,k). - _Amiram Eldar_, Jun 30 2020
%e A269430 2.0707963267948966192313216916397514420985846996875529...
%o A269430 (Sage) N((1+pi)/2, digits=110)
%o A269430 (PARI) (1 + Pi)/2 \\ _Altug Alkan_, Apr 07 2016
%Y A269430 Cf. A000796, A002193, A002194, A002163, A174968, A001622, A002161, A010767, A011002, A011003, A191502, A053004.
%K A269430 cons,nonn
%O A269430 1,1
%A A269430 _Jani Melik_, Feb 26 2016