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

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A208169 Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors 1
1, 13, 8469, 99752346, 16567902881244, 38625516979536823947, 1263976383376771173195964686, 580579239138791881884932674640711196, 3743190521310525744113304412007474906812935048 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A208175

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..10

EXAMPLE

Some solutions for n=4

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

..0..1..1..2....1..1..0..0....2..2..1..2....1..0..1..2....1..1..1..1

..1..0..1..3....2..3..3..0....1..1..3..2....2..2..1..0....2..1..2..3

..1..3..3..1....0..2..1..3....0..3..0..0....0..3..0..1....0..1..2..0

CROSSREFS

Sequence in context: A013524 A060887 A020521 * A205162 A122429 A173506

Adjacent sequences:  A208166 A208167 A208168 * A208170 A208171 A208172

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 24 2012

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 January 22 16:37 EST 2020. Contains 331152 sequences. (Running on oeis4.)