login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A266424 Number of nX4 binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing. 1
5, 25, 106, 404, 1391, 4383, 12758, 34611, 88206, 212609, 487630, 1069664, 2254259, 4581719, 9011222, 17200214, 31944220, 57853902, 102380657, 177341666, 301156443, 502075951, 822789263, 1326908069, 2107999291, 3302022425 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A266428.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..66

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A266428.

Sequence in context: A218264 A264018 A067971 * A224129 A111641 A074419

Adjacent sequences:  A266421 A266422 A266423 * A266425 A266426 A266427

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2015

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 9 04:17 EDT 2021. Contains 343685 sequences. (Running on oeis4.)