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 A233446 #8 Jun 06 2021 09:05:00
%S A233446 1,23,2637,705259,337390073,252186614847,271082082053317,
%T A233446 396049017137512403,754792662169555947633,1818644980834260579498343,
%U A233446 5405067064522549127719680701,19423396040054801221090342470843,83016890560608261435356904433668457,416213066932582983199004231480676255119,2419095491735191624607023665166934072373813
%N A233446 a(n) = ((2n-1)^(2n+1) + (2n+1)^(2n-1))/(2n)^2 = A154682(n)/(2n)^2 for n > 0.
%F A233446 a(n) = ((2n-1)^(2n+1) + (2n+1)^(2n-1))/(2n)^2; n > 0.
%t A233446 Table[((2 n - 1)^(2 n + 1) + (2 n + 1)^(2 n - 1))/(2 n)^2, {n, 1, 15}]
%Y A233446 Cf. A154682.
%K A233446 nonn
%O A233446 1,2
%A A233446 _Alexander Adamchuk_, Dec 10 2013