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!)
A221665 Sum of neighbor maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their horizontal, diagonal and antidiagonal neighbors in a random 0..2 nX4 array 0
16, 256, 3772, 63200, 1048576, 16777216, 268281856, 4294967296, 68702508544, 1099511627776, 17592133540864, 281474976710656, 4503599627370496 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A221666

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A122609 A206571 A206791 * A227592 A206840 A222932

Adjacent sequences:  A221662 A221663 A221664 * A221666 A221667 A221668

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 21 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 18 00:43 EST 2022. Contains 350410 sequences. (Running on oeis4.)