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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A223675 Number of n X n 0..1 arrays with rows and antidiagonals unimodal 0
2, 16, 316, 9822, 384009, 17068664, 821284360, 41697505423, 2202335611907, 120016210924727, 6715040320826544, 384617913213951506, 22513060559771644440, 1345458233683987073442, 82071805127975022481091 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A223680

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A174487 A140051 A264658 * A189058 A189189 A188867

Adjacent sequences:  A223672 A223673 A223674 * A223676 A223677 A223678

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 25 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 December 5 23:38 EST 2021. Contains 349558 sequences. (Running on oeis4.)