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 A004528 #10 Oct 26 2023 08:31:33 %S A004528 1,1,2,4,8,24,96,384,1536,7680,46080,276480,1658880,11612160,92897280, %T A004528 743178240,5945425920,53508833280,535088332800,5350883328000, %U A004528 53508833280000,588597166080000,7063165992960000 %N A004528 Ratios of successive terms are 1,2,2,2,3,4,4,4,5,6,6,6,7,... %Y A004528 Cf. A004524. %K A004528 nonn %O A004528 0,3 %A A004528 _N. J. A. Sloane_