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 A369388 #5 Jan 22 2024 10:41:46
%S A369388 1,3,9,45,249,1373,9177,62257,453179,3320531,24087877,183643865,
%T A369388 1394580343,10794949627,85730722969,686171829489,5487361175591,
%U A369388 43981108061647,358362244544957,2922625435214613,24006575088945973,199229783030494775,1653790732247194785
%N A369388 a(n) is the constant term in expansion of Product_{k=1..n} (x^prime(k) + 1 + 1/x^prime(k))^2.
%t A369388 Table[Coefficient[Product[(x^Prime[k] + 1 + 1/x^Prime[k])^2, {k, 1, n}], x, 0], {n, 0, 22}]
%Y A369388 Cf. A047653, A156181, A350880, A350881.
%K A369388 nonn
%O A369388 0,2
%A A369388 _Ilya Gutkovskiy_, Jan 22 2024