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 A046725 #12 Mar 07 2020 21:28:14 %S A046725 1,6,32,152,690,3028,12996,54812,228284,939148,3833076,15487428, %T A046725 62244564,247973928,984221764,3876113404,15223550024,59379645924, %U A046725 231124139318,894157177372,3453279084296,13266154255196,50886266714598,194294744477756,740816697816046 %N A046725 Number of semi-meanders of order n with 6 components. %H A046725 Andrew Howroyd, <a href="/A046725/b046725.txt">Table of n, a(n) for n = 6..40</a> %H A046725 P. Di Francesco, O. Golinelli and E. Guitter, <a href="http://arXiv.org/abs/hep-th/9506030">Meander, folding and arch statistics</a>, arXiv:hep-th/9506030, 1995. %Y A046725 Cf. A000682, A046726. %K A046725 nonn %O A046725 6,2 %A A046725 _N. J. A. Sloane_ %E A046725 a(15)-a(40) from _Andrew Howroyd_, Dec 07 2015