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 A147860 #18 Apr 11 2020 10:20:50 %S A147860 24,7960,240480,2934568,21663936,115970400,495329520,1787153280, %T A147860 5652862776,16082870232,41929743856,101579030280,231145969600, %U A147860 498267767424,1024487280288,2020455667392,3839788818840,7059475223640,12597342069312,21880343758504,37081456651008 %N A147860 Number of consistent sets of 6 irreflexive binary order relationships over n objects. %H A147860 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 A147860 a(n) = (n-3)*(n-2)*(n-1)*n*(n^8 - 26*n^6 - 60*n^5 + 131*n^4 + 1200*n^3 + 3374*n^2 - 4140*n - 44640)/720. - _Vaclav Kotesovec_, Apr 11 2020 %Y A147860 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), A147872 (k = 7), A147881 (k = 8), A147883 (k = 9), A147964 (k = 10). %Y A147860 Column k = 6 of A081064. %K A147860 nonn %O A147860 4,1 %A A147860 _R. H. Hardin_, May 04 2009 %E A147860 More terms from _Vaclav Kotesovec_, Apr 11 2020 %E A147860 Offset changed to n=4 by _Petros Hadjicostas_, Apr 11 2020