login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A224127 Number of n X n 0..1 arrays with rows nondecreasing and antidiagonals unimodal. 1
2, 9, 58, 419, 3149, 24095, 186348, 1452236, 11385356, 89697284, 709549769, 5632222541, 44837998135, 357848802839, 2862135963926, 22934807116783, 184082328044394, 1479641153930348, 11908495546392890, 95951907989239148 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A224133.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..22

EXAMPLE

Some solutions for n=3:

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

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

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

CROSSREFS

Cf. A224133.

Sequence in context: A141787 A047852 A240881 * A116867 A168358 A132608

Adjacent sequences:  A224124 A224125 A224126 * A224128 A224129 A224130

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 31 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 26 21:56 EDT 2022. Contains 354092 sequences. (Running on oeis4.)