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 A260231 #9 Jul 19 2025 15:10:51
%S A260231 2,10,280,71960,224946960,10495350312720,8643382777938679680,
%T A260231 145011908479540041684850560,56180584638978557924165229531974400,
%U A260231 561805846445966163880630853243909229531974400,160289764609087349005207761687490741791453382934816332800
%N A260231 a(n) = Product_{k=1..n} (1 + k^k).
%F A260231 a(n) ~ c * A002109(n), where c = Product_{k>=1} (1 + 1/k^k) = 2.60361190459951423330221282635022049352582879064202503882732200701325334...
%t A260231 Table[Product[1+k^k,{k,1,n}],{n,1,12}]
%t A260231 FoldList[Times,Table[1+k^k,{k,12}]] (* _Harvey P. Dale_, Jul 19 2025 *)
%Y A260231 Cf. A000312, A002109, A028361, A054640, A082480, A217757, A258325.
%K A260231 nonn
%O A260231 1,1
%A A260231 _Vaclav Kotesovec_, Jul 20 2015