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!)
A223627 Number of 3Xn 0..1 arrays with row sums nondecreasing and column sums unimodal 1
4, 26, 147, 751, 3560, 15778, 67030, 274631, 1088767, 4218662, 16015929, 59653826, 219063215, 794078382, 2843032061, 10081383128, 35429305737, 123436612116, 427070556002, 1467917436855, 5013326271265, 17031672794426, 57571509067410 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A223625

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..116

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A229278 A180226 A325587 * A144068 A204062 A121767

Adjacent sequences:  A223624 A223625 A223626 * A223628 A223629 A223630

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2013

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 February 24 07:19 EST 2020. Contains 332199 sequences. (Running on oeis4.)