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 A334283 #5 Apr 21 2020 19:07:17
%S A334283 1,1,1,3,-3,11,-47,291,-361,-327,2651,8117,-23761,-920509,3401813,
%T A334283 48080231,-949833905,-533061737,47194458351,9309105461,-5717668358773,
%U A334283 5794759242411,416358013987311,-3775846647202969,-144292064358491357,269618719159718919,14658236743430975341
%N A334283 Numerators of power series coefficients of A(x) satisfying A(A(x)) = x + Sum_{k>=2} prime(k-1) * x^k.
%H A334283 Wikipedia, <a href="https://en.wikipedia.org/wiki/Functional_square_root">Functional square root</a>
%e A334283 1, 1, 1/2, 3/4, -3/8, 11/8, -47/16, 291/64, -361/128, -327/64, 2651/256, 8117/512, -23761/1024, -920509/2048, ...
%Y A334283 Cf. A008578, A030274, A030278, A334284 (denominators).
%K A334283 sign,frac
%O A334283 1,4
%A A334283 _Ilya Gutkovskiy_, Apr 21 2020