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!)
A211105 1/4 the number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one, two or three distinct values 1
16, 928, 196480, 151767424, 427712112640, 4397802725483392, 164979998407434893440, 22580741254744671390333952, 11276035715844307701828163309696, 20544048912459992331220711095896934784 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..11

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A260620 A290940 A173953 * A276637 A211081 A197449

Adjacent sequences:  A211102 A211103 A211104 * A211106 A211107 A211108

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 31 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 November 30 17:12 EST 2021. Contains 349424 sequences. (Running on oeis4.)