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 A293045 #6 Oct 09 2017 23:21:42
%S A293045 0,0,0,0,0,2,15,102,854,7852,79867,890348,10799874,141647368,
%T A293045 1997815108,30156348228,485117044074,8285798537070,149759338727585,
%U A293045 2855791585334774,57300933786123530,1206811729692494152,26619251746350630597,613691499376088985144
%N A293045 Number of odd permutations s of {1,2,...,n} such that |s(i)-i| > 1 for each i=1,2,...,n.
%H A293045 Dmitry Efimov, <a href="https://arxiv.org/abs/1702.05655">Determinants of generalized binary band matrices</a>, arXiv:1702.05655 [math.RA], 2017.
%F A293045 a(n) = (A001883(n) - d(n))/2, where d(n) = (3-n)/3 if n = 0 mod 3, d(n) = (n-1)/3 if n = 1 mod 3, d(n) = 0 if n = 2 mod 3.
%Y A293045 Cf. A001883, A293044.
%K A293045 nonn
%O A293045 0,6
%A A293045 _Eric M. Schmidt_, Oct 09 2017