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 A094631 #6 Jan 25 2020 17:54:21 %S A094631 1,0,0,184,16936,2711904,675457000,232383728378,105676839790294, %T A094631 61466235823794521,44524673319233300950,39314601406037457009543, %U A094631 41574584860907056125473119,51879840704758774687928224799,75441055286834286248687362255451,126462548502721304612260672370098185 %N A094631 Number of n-block 3-uniform T_0-covers. %C A094631 a(n) is the number of binary matrices with n distinct columns and any number of distinct nonzero rows with 3 ones in every column and columns in decreasing lexicographic order. - _Andrew Howroyd_, Jan 25 2020 %H A094631 Andrew Howroyd, <a href="/A094631/b094631.txt">Table of n, a(n) for n = 0..100</a> %Y A094631 Row n=3 of A331569. %Y A094631 Cf. A094630, A059530, A060070. %K A094631 nonn %O A094631 0,4 %A A094631 Goran Kilibarda, _Vladeta Jovovic_, May 15 2004 %E A094631 Terms a(11) and beyond from _Andrew Howroyd_, Jan 25 2020