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 A276274 #42 Jun 15 2025 23:59:20
%S A276274 1,387420489,88817841970012523233890533447265625,
%T A276274 66009724686219550843768321818371771650147004059278069406814190436565131829325062449
%N A276274 a(n) = (2*n+1)^(2*(2*n+1)^2).
%C A276274 All terms are odd squares and are of the form k^k, where k = (2n+1)^2.
%H A276274 Christopher C. Capobianco, <a href="/A276274/b276274.txt">Table of n, a(n) for n = 0..20</a>
%e A276274 For n = 1, k = 3^2 = 9 and so a(1) = 3^(2*3^2) = 3^18 = 387420489.
%p A276274 A276274:=n->(2*n+1)^(2*(2*n+1)^2): seq(A276274(n), n=0..4); # _Wesley Ivan Hurt_, Sep 29 2016
%t A276274 Table[(2x+1)^(2(2x+1)^2),{x,0,5}]
%o A276274 (PARI) a(n)=my(k=(2*n+1)^2); k^k \\ _Charles R Greathouse IV_, Aug 30 2016
%Y A276274 Subsequence of A000312, containing only the odd squares.
%Y A276274 Intersection of A000312 and A016754.
%K A276274 nonn
%O A276274 0,2
%A A276274 _Christopher C. Capobianco_, Aug 26 2016