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A204479 Number of (n+2)X6 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
1899, 2745, 1587, 1482, 3270, 11364, 33788, 125749, 476619, 1783368, 6757316, 25622336, 97073670, 368025451, 1395302683, 5289791566, 20055095722, 76034674700, 288268723496, 1092909614313, 4143535016651, 15709332068284 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A204483

LINKS

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

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

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

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

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

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

CROSSREFS

Sequence in context: A221041 A221504 A157760 * A251346 A078862 A190652

Adjacent sequences:  A204476 A204477 A204478 * A204480 A204481 A204482

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2012

STATUS

approved

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Last modified February 25 12:28 EST 2021. Contains 341606 sequences. (Running on oeis4.)