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 A277355 #9 Oct 10 2016 08:32:56
%S A277355 1,3,18,198,3960,146520,10256400,1384614000,365538096000,
%T A277355 190445348016000,196920489848544000,405459288598152096000,
%U A277355 1665626757561208810368000,13666467545789718289069440000,224102734815859800504160677120000,7346759955468331839927899478024960000
%N A277355 a(n) = Product_{k=1..n} (2^k + k).
%F A277355 a(n) ~ c * 2^(n*(n+1)/2), where c = Product_{k>=1} (1 + k/2^k) = 5.52995584900...
%t A277355 Table[Product[2^k+k, {k, 1, n}], {n, 0, 15}]
%Y A277355 Cf. A005329, A028362.
%K A277355 nonn
%O A277355 0,2
%A A277355 _Vaclav Kotesovec_, Oct 10 2016