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!)
A229571 Number of defective 4-colorings of an n X n 0..3 array connected horizontally, vertically, diagonally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..3 order. 0
0, 6, 76, 312, 924, 2440, 6108, 14840, 35356, 83016, 192636, 442552, 1007868, 2277704, 5112220, 11403768, 25297500, 55837384, 122684220, 268436408, 585106492 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A229578.

LINKS

Table of n, a(n) for n=1..21.

FORMULA

Empirical (for n>=9): a(n) = 9*a(n-1) - 33*a(n-2) + 63*a(n-3) - 66*a(n-4) + 36*a(n-5) - 8*a(n-6). - Vaclav Kotesovec, Feb 14 2014

EXAMPLE

Some solutions for n=3:

  0 1 2   0 1 0   0 1 0   0 1 1   0 1 0   0 1 0   0 1 2

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

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

CROSSREFS

Cf. A229578.

Sequence in context: A350283 A350411 A263228 * A016090 A181343 A241072

Adjacent sequences:  A229568 A229569 A229570 * A229572 A229573 A229574

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 26 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 January 26 13:42 EST 2022. Contains 350598 sequences. (Running on oeis4.)