This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A180984 T(n,k)=number of nXk binary matrices with rows and columns in lexicographically strictly increasing order 1
 2, 1, 1, 0, 3, 0, 0, 3, 3, 0, 0, 1, 15, 1, 0, 0, 0, 31, 31, 0, 0, 0, 0, 34, 234, 34, 0, 0, 0, 0, 21, 925, 925, 21, 0, 0, 0, 0, 7, 2366, 10706, 2366, 7, 0, 0, 0, 0, 1, 4305, 77079, 77079, 4305, 1, 0, 0, 0, 0, 0, 5845, 400672, 1411450, 400672, 5845, 0, 0, 0, 0, 0, 0, 6059, 1621242 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts .2.1..0....0........0..........0.............0...............0 .1.3..3....1........0..........0.............0...............0 .0.3.15...31.......34.........21.............7...............1 .0.1.31..234......925.......2366..........4305............5845 .0.0.34..925....10706......77079........400672.........1621242 .0.0.21.2366....77079....1411450......18068175.......179023089 .0.0..7.4305...400672...18068175.....539124281.....12176364503 .0.0..1.5845..1621242..179023089...12176364503....607445721710 .0.0..0.6059..5329869.1451615923..223274567811..24245093840300 .0.0..0.4830.14617117.9963573356.3463014573021.813139746187214 LINKS R. H. Hardin, Table of n, a(n) for n=1..312 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..1..0....0..1..0 ..0..1..0....0..1..1....1..0..1....0..1..1....1..0..0....1..1..0....1..0..1 ... ..0..0..1....0..0..1....0..0..1....0..0..1....0..0..1....0..1..1....0..1..1 ..0..1..0....0..1..1....0..1..1....0..1..1....0..1..1....1..0..0....1..0..1 ..1..1..1....1..0..0....1..1..0....1..0..1....1..1..1....1..0..1....1..1..0 ... ..0..1..1 ..1..0..1 ..1..1..1 CROSSREFS Sequence in context: A253587 A110962 A065715 * A051628 A163540 A127967 Adjacent sequences:  A180981 A180982 A180983 * A180985 A180986 A180987 KEYWORD nonn,tabl AUTHOR R. H. Hardin Sep 30 2010 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 5 18:49 EST 2019. Contains 329768 sequences. (Running on oeis4.)