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 A059735 #17 Aug 27 2019 09:33:39
%S A059735 1,1,2,3,10,34,272,3528,97144,4870920,452016608,77054901728,
%T A059735 24271105072736,14200712295904928,15510501136026729216,
%U A059735 31765207922047709885696,122456389219489134370435456,891699423142395494501906828160,12302820585630191716774996205431296
%N A059735 Number of complementary pairs of tournaments on n nodes.
%H A059735 Andrew Howroyd, <a href="/A059735/b059735.txt">Table of n, a(n) for n = 1..50</a>
%H A059735 Nevena Francetić, Sarada Herke, Ian M. Wanless, <a href="https://arxiv.org/abs/1703.04764">Parity of Sets of Mutually Orthogonal Latin Squares</a>, arXiv:1703.04764 [math.CO], 2017. See Section 4.1.
%H A059735 V. A. Liskovets, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL3/LISK/Derseq.html">Some easily derivable sequences</a>, J. Integer Sequences, 3 (2000), #00.2.2.
%F A059735 Average of A000568 and A002785.
%t A059735 A000568 = Cases[Import["https://oeis.org/A000568/b000568.txt", "Table"], {_, _}][[All, 2]];
%t A059735 A002785 = Cases[Import["https://oeis.org/A002785/b002785.txt", "Table"], {_, _}][[All, 2]];
%t A059735 a[n_] := (A000568[[n + 1]] + A002785[[n]])/2;
%t A059735 Array[a, 19] (* _Jean-François Alcover_, Aug 27 2019 *)
%Y A059735 Cf. A000568, A002785.
%K A059735 nonn,easy
%O A059735 1,3
%A A059735 _N. J. A. Sloane_, Feb 09 2001
%E A059735 More terms from Pab Ter (pabrlos2(AT)yahoo.com), Nov 06 2005
%E A059735 Terms a(18) and beyond from _Andrew Howroyd_, Sep 17 2018