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 A080406 #13 Feb 17 2021 09:23:56 %S A080406 3,10,32,73,457,1994,6407,29489,148253,852592,5420543,37975111, %T A080406 290066507,2400720769,21396506651,204322668174,2081209926313, %U A080406 22523982873141,258105780607144,3121989826825492,39750408190737416 %N A080406 Boustrophedon transform of the continued fraction of Pi (cf. A001203). %H A080406 J. Millar, N. J. A. Sloane and N. E. Young, A new operation on sequences: the Boustrophedon transform, J.Combin. Theory, 17A (1996) 44-54 (<a href="http://neilsloane.com/doc/bous.txt">Abstract</a>, <a href="http://neilsloane.com/doc/bous.pdf">pdf</a>, <a href="http://neilsloane.com/doc/bous.ps">ps</a>). %H A080406 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %H A080406 <a href="/index/Bo#boustrophedon">Index entries for sequences related to boustrophedon transform</a> %F A080406 a(n) appears to be asymptotic to C*n!*(2/Pi)^n where C=136.651536367325329682973604897976758877614262731284965133228708820... - _Benoit Cloitre_ and Mark Hudson (mrmarkhudson(AT)hotmail.com) %e A080406 We simply apply the Boustrophedon transform to [3,7,15,1,292,1,1,1,...] %Y A080406 Cf. A001203, A000796. %K A080406 nonn,easy %O A080406 0,1 %A A080406 Mark Hudson (mrmarkhudson(AT)hotmail.com), Feb 17 2003