A208395 - OEIS

A208395

Number of 4 X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

14, 1094, 79092, 5800644, 424785708, 31112194860, 2278687944204, 166893600277548, 12223468411103052, 895260103173464940, 65569822288888377996, 4802404999579303113900, 351733358040572021645772

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

OFFSET

1,1

COMMENTS

Row 4 of A208392.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 61*a(n-1) +868*a(n-2) +2200*a(n-3) -7744*a(n-4) -17728*a(n-5) +40704*a(n-6) -13824*a(n-7) for n>9.

EXAMPLE

Some solutions for n=4

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