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 A362112 #11 Apr 14 2023 13:06:46 %S A362112 1,1,4,26,254,3538,67014,1660866,52230550,2033261906,96018823814, %T A362112 5409008246626,358368831222006,27589872391918194,2442595357421865574, %U A362112 246430234111929035906,28106918525950072081622,3598669462582938225587602,513978991104098010878849094 %N A362112 a(0)=1; thereafter a(n) = 2*A110501(n+1) - A005439(n). %H A362112 Bishal Deb and Alan D. Sokal, <a href="https://arxiv.org/abs/2212.07232">Classical continued fractions for some multivariate polynomials generalizing the Genocchi and median Genocchi numbers</a>, arXiv:2212.07232 [math.CO], 2022. Section 3.1. %o A362112 (Python) %o A362112 from math import comb %o A362112 from sympy import bernoulli %o A362112 def A362112(n): return ((4<<(m:=n+1<<1))-4)*abs(bernoulli(m))-abs(sum(comb(n,k)*(2-(2<<n+k+1))*bernoulli(n+k+1) for k in range(n+1))) # _Chai Wah Wu_, Apr 14 2023 %Y A362112 Cf. A110501, A005439. %K A362112 nonn %O A362112 0,3 %A A362112 _N. J. A. Sloane_, Apr 14 2023 %E A362112 More terms from _Chai Wah Wu_, Apr 14 2023