A204049 - OEIS

A204049

Number of (n+2)X3 0..3 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order

1379, 10447, 80391, 622031, 4823759, 37451727, 290942303, 2260735279, 17568741535, 136538226767, 1061153916031, 8247213992175, 64097090111007, 498161733185935, 3871710470155071, 30090928730621231, 233866710624036959

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

OFFSET

1,1

COMMENTS

Column 1 of A204056

LINKS

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

FORMULA

Empirical: a(n) = 11*a(n-1) -31*a(n-2) +69*a(n-3) -176*a(n-4) -8*a(n-5) -116*a(n-6) -132*a(n-7) +240*a(n-8) +144*a(n-9)

EXAMPLE

Some solutions for n=3

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