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 A147881 #16 Apr 12 2020 08:41:23 %S A147881 3330,750810,31528980,572121396,6186026736,47056700160,277413461820, %T A147881 1346956001820,5610483560682,20631960791442,68410542640440, %U A147881 207816360293880,585602287143120,1545890870506608,3853704950392968,9131773574418120,20681704245537090,44975479946588730 %N A147881 Number of consistent sets of 8 irreflexive binary order relationships over n objects. %H A147881 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 A147881 a(n) = (n-4)*(n-3)*(n-2)*(n-1)*n*(n^11 + 2*n^10 - 43*n^9 - 226*n^8 - 21*n^7 + 5110*n^6 + 36247*n^5 + 91954*n^4 - 612172*n^3 - 5449152*n^2 - 2743020*n + 82544280)/40320. - _Vaclav Kotesovec_, Apr 11 2020 %Y A147881 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), A147883 (k = 9), A147964 (k = 10). %Y A147881 Column k = 8 of A081064. %K A147881 nonn %O A147881 5,1 %A A147881 _R. H. Hardin_, May 04 2009 %E A147881 More terms from _Vaclav Kotesovec_, Apr 11 2020 %E A147881 Offset changed to n=5 by _Petros Hadjicostas_, Apr 11 2020