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 A147883 #17 Apr 12 2020 08:41:32 %S A147883 960,838130,71331470,2134043800,33969932808,353530511420, %T A147883 2710992616420,16512265636680,83974746129560,369225271340926, %U A147883 1439572248244130,5072665106738320,16393720098232880,49158099955813080,138052747638032104,365886966555545840,920991546926843280 %N A147883 Number of consistent sets of 9 irreflexive binary order relationships over n objects. %H A147883 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 A147883 a(n) = (n-4)*(n-3)*(n-2)*(n-1)*n*(n^13 + n^12 - 61*n^11 - 271*n^10 + 501*n^9 + 10539*n^8 + 69721*n^7 + 170899*n^6 - 1975510*n^5 - 21334612*n^4 - 30150228*n^3 + 619527780*n^2 + 1942605000*n - 10974342960)/362880. - _Vaclav Kotesovec_, Apr 11 2020 %Y A147883 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), A147872 (k = 7), A147881 (k = 8), A147964 (k = 10). %Y A147883 Column k = 9 of A081064. %K A147883 nonn %O A147883 5,1 %A A147883 _R. H. Hardin_, May 04 2009 %E A147883 More terms from _Vaclav Kotesovec_, Apr 11 2020 %E A147883 Offset changed to n=5 by _Petros Hadjicostas_, Apr 11 2020