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 A147872 #14 Apr 11 2020 10:21:00 %S A147872 6540,496680,10931760,124318112,934536600,5284309680,24238001040, %T A147872 94622473440,324833152644,1003729086360,2840342968320,7458732665280, %U A147872 18365400613040,42754133712096,94739078371680,200943535287360,409861294271100,807103156903560,1539611666989968 %N A147872 Number of consistent sets of 7 irreflexive binary order relationships over n objects. %H A147872 V. I. Rodionov, <a href="https://doi.org/10.1016/0012-365X(92)90155-9">On the number of labeled acyclic digraphs</a>, Discr. Math. 105 (1-3) (1992), 319-321. %F A147872 a(n) = (n-4)*(n-3)*(n-2)*(n-1)*n*(n^9 + 3*n^8 - 26*n^7 - 168*n^6 - 259*n^5 + 1743*n^4 + 15044*n^3 + 40722*n^2 - 111060*n - 817320)/5040. - _Vaclav Kotesovec_, Apr 11 2020 %Y A147872 Related sequences for the number of consistent sets of k irreflexive binary order relationships over n objects: A147796 (k = 3), A147817 (k = 4), A147821 (k = 5), A147860 (k = 6), A147881 (k = 8), A147883 (k = 9), A147964 (k = 10). %Y A147872 Column k = 7 of A081064. %K A147872 nonn %O A147872 5,1 %A A147872 _R. H. Hardin_, May 04 2009 %E A147872 More terms from _Vaclav Kotesovec_, Apr 11 2020 %E A147872 Offset changed to n=5 by _Petros Hadjicostas_, Apr 11 2020