A209963 - OEIS

A209963

Number of (n+1)X3 0..3 arrays containing all values 0..3 with every 2X2 subblock having one or two distinct values, and new values 0..3 introduced in row major order

0, 26, 665, 13529, 235614, 3745144, 56080379, 806021187, 11250016056, 153671659498, 2065329135285, 27415388492285, 360428944284258, 4702933675666684, 60999760074268959, 787454521196946391

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

OFFSET

1,2

COMMENTS

Column 2 of A209969

LINKS

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

FORMULA

Empirical: a(n) = 33*a(n-1) -374*a(n-2) +1586*a(n-3) -1093*a(n-4) -4559*a(n-5) +7212*a(n-6) -420*a(n-7) -4336*a(n-8) +2208*a(n-9) -256*a(n-10)

EXAMPLE

Some solutions for n=4

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