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A094631 Number of n-block 3-uniform T_0-covers. 4
1, 0, 0, 184, 16936, 2711904, 675457000, 232383728378, 105676839790294, 61466235823794521, 44524673319233300950, 39314601406037457009543, 41574584860907056125473119, 51879840704758774687928224799, 75441055286834286248687362255451, 126462548502721304612260672370098185 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

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.

Sequence in context: A221782 A296780 A035831 * A060491 A203843 A151586

Adjacent sequences:  A094628 A094629 A094630 * A094632 A094633 A094634

KEYWORD

nonn

AUTHOR

Goran Kilibarda, Vladeta Jovovic, May 15 2004

EXTENSIONS

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

STATUS

approved

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Last modified April 6 12:08 EDT 2020. Contains 333273 sequences. (Running on oeis4.)