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!)
A192767 Number of n X n symmetric 0..4 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 4 and with new values 0..4 introduced in lower triangular row major order 0
0, 0, 0, 0, 2432, 5693147, 22718529036, 246577454328217, 8154425735827153538, 877838603725481966872516 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

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

EXAMPLE

Some solutions for 5X5

..0..0..2..2..2....0..0..1..2..4....0..0..0..2..4....0..0..0..2..2

..0..1..1..2..0....0..1..1..2..4....0..0..1..2..4....0..1..1..3..2

..2..1..3..3..0....1..1..1..3..3....0..1..1..3..4....0..1..1..3..4

..2..2..3..3..4....2..2..3..0..0....2..2..3..3..3....2..3..3..3..4

..2..0..0..4..4....4..4..3..0..0....4..4..4..3..3....2..2..4..4..4

CROSSREFS

Sequence in context: A202201 A147984 A229871 * A341286 A250710 A278196

Adjacent sequences:  A192764 A192765 A192766 * A192768 A192769 A192770

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 09 2011

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 November 30 17:12 EST 2021. Contains 349424 sequences. (Running on oeis4.)