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 A133798 #10 Feb 16 2025 08:33:06 %S A133798 0,0,3,14,75,454,3185,25486,229383,2293838,25232229,302786758, %T A133798 3936227867,55107190150,826607852265,13225725636254,224837335816335, %U A133798 4047072044694046,76894368849186893,1537887376983737878 %N A133798 a(n) = A002467(n) - 1. %C A133798 n divides a(n) and a(n+2) for odd n. 2 divides a(n) for even n. - _Alexander Adamchuk_, Jan 11 2008 %H A133798 Alexander Adamchuk, Jan 11 2008, <a href="/A133798/b133798.txt">Table of n, a(n) for n = 1..51</a> %H A133798 E. W. Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Mousetrap.html">Mousetrap</a>. %t A133798 Denominator[k=1; NestList[1+1/(k++ #1)&, 1, 50]] - 1 (* _Alexander Adamchuk_, Jan 11 2008 *) %Y A133798 Cf. A002467. %K A133798 nonn %O A133798 1,3 %A A133798 _Zak Seidov_, Jan 07 2008