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 A362407 #21 Sep 03 2023 10:18:43 %S A362407 1,1,1,43,223,60623,764783,107351407,2499928867,596767688063, %T A362407 22200786516383,64470807442488761,3504534741776035061, %U A362407 3597207408242668198973,268918457620309807441853,185388032403184965693274807,18241991360742724891839902347 %N A362407 Numerators of the expansion of the series reversion of sin(x) + x, odd powers only. %F A362407 Conjecture: a(n) = abs(A302977(n)). %e A362407 f^-1(x) = (1/2)*x + (1/96)*x^3 + (1/1920)*x^5 + (43/1290240)*x^7 + ... %o A362407 (PARI) a(n) = numerator(polcoef(serreverse(sin(x + O(x^(2*n))) + x), 2*n-1)) \\ _Andrew Howroyd_, Apr 18 2023 %Y A362407 Cf. A362406 (denominators). %Y A362407 Cf. A302977, A306254. %K A362407 nonn,frac %O A362407 0,4 %A A362407 _Billy Bolton_, Apr 18 2023