A180988 - OEIS

A180988

T(n,k)=number of nXk binary matrices with rows in lexicographically nondecreasing order and columns in strictly increasing order

2, 1, 3, 0, 4, 4, 0, 3, 10, 5, 0, 1, 21, 20, 6, 0, 0, 33, 85, 35, 7, 0, 0, 34, 330, 260, 56, 8, 0, 0, 21, 1027, 2051, 666, 84, 9, 0, 0, 7, 2429, 14610, 9646, 1506, 120, 10, 0, 0, 1, 4326, 86669, 140199, 37527, 3102, 165, 11, 0, 0, 0, 5848, 417934, 1820715, 1042746, 126889

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Table starts

..2...1.....0.......0.........0...........0.............0................0

..3...4.....3.......1.........0...........0.............0................0

..4..10....21......33........34..........21.............7................1

..5..20....85.....330......1027........2429..........4326.............5848

..6..35...260....2051.....14610.......86669........417934..........1644628

..7..56...666....9646....140199.....1820715......20114655........187187759

..8..84..1506...37527...1042746....27740695.....653629616......13274938582

..9.120..3102..126889...6452404...337921780...16343840487.....696496706166

.10.165..5940..384585..34637217..3474279349..336821069819...29455736927336

.11.220.10725.1066848.165746932.31178428721.5958448681626.1054259213026448

LINKS

R. H. Hardin, Table of n, a(n) for n=1..287

EXAMPLE

All solutions for 3X3

..0..0..0....0..0..0....0..0..0....0..0..1....0..0..1....0..0..1....0..0..1

..0..0..1....0..0..1....0..1..1....0..1..0....0..1..0....0..0..1....0..0..1

..0..1..0....0..1..1....1..0..1....0..1..0....0..1..1....0..1..0....0..1..1

...

..0..0..1....0..0..1....0..0..1....0..0..1....0..0..1....0..0..1....0..0..1

..0..1..1....0..1..0....0..1..0....0..1..0....0..1..0....0..1..1....0..1..1

..0..1..1....1..0..0....1..1..0....1..0..1....1..1..1....1..0..0....1..1..0

...

..0..0..1....0..0..1....0..1..1....0..1..1....0..1..1....0..1..1....0..1..1

..0..1..1....0..1..1....0..1..1....1..0..0....1..0..1....1..0..1....1..0..1

..1..0..1....1..1..1....1..0..1....1..0..1....1..1..0....1..0..1....1..1..1

CROSSREFS

Sequence in context: A058208 A070817 A231347 * A127474 A364015 A363158

Adjacent sequences: A180985 A180986 A180987 * A180989 A180990 A180991

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Sep 30 2010

STATUS

approved