A094631 Number of n-block 3-uniform T_0-covers.

1, 0, 0, 184, 16936, 2711904, 675457000, 232383728378, 105676839790294, 61466235823794521, 44524673319233300950, 39314601406037457009543, 41574584860907056125473119, 51879840704758774687928224799, 75441055286834286248687362255451, 126462548502721304612260672370098185

Offset: 0

Author

Goran Kilibarda, Vladeta Jovovic, May 15 2004

Keywords

• nonn

Comments

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

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..100

Crossrefs

Row n=3 of A331569.

Cf. A094630, A059530, A060070.

Extensions

Terms a(11) and beyond from Andrew Howroyd, Jan 25 2020