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A204482 Number of (n+2)X9 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..3 introduced in row major order 1
70726, 111707, 34964, 33788, 35990, 47369, 66580, 159783, 520508, 1817618, 6795292, 25689877, 97112294, 368075253, 1395441180, 5289843312, 20055181002, 76035026065, 288268814608, 1092909806027, 4143536006620, 15709332277494 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A204483

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..129

FORMULA

Empirical: a(n) = 4*a(n-1) +a(n-2) -2*a(n-3) -19*a(n-4) -4*a(n-5) +21*a(n-6) +24*a(n-7) +3*a(n-8) -18*a(n-9) -9*a(n-10) for n>13

EXAMPLE

Some solutions for n=3

..0..1..1..0..0..1..1..2..3....0..1..0..0..2..0..0..2..3

..0..1..1..0..0..1..1..2..3....0..1..0..0..2..0..0..2..3

..0..1..1..0..0..1..1..2..3....0..1..0..0..2..0..0..2..3

..0..1..1..0..0..1..1..2..3....0..1..0..0..2..0..0..2..3

..1..1..1..0..0..1..1..2..3....0..1..0..0..2..0..0..2..3

CROSSREFS

Sequence in context: A253738 A252104 A236016 * A186821 A252728 A226530

Adjacent sequences:  A204479 A204480 A204481 * A204483 A204484 A204485

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2012

STATUS

approved

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Last modified November 29 18:41 EST 2021. Contains 349416 sequences. (Running on oeis4.)