A221631 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

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 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A221631

Equals one maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 nX4 array

8, 176, 3848, 64828, 1047216, 16774800, 268431156, 4294959928, 68719464306, 1099511606852, 17592186009096, 281474976650752, 4503599627268410, 72057594037753300, 1152921504606547488, 18446744073709037416

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 4 of A221632

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..37

EXAMPLE

Some solutions for n=3

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

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

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