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A204488 Number of (n+2)X6 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly one way, and new values 0..1 introduced in row major order 1
1690, 2627, 5407, 11137, 22341, 44712, 90942, 187020, 388236, 811400, 1704979, 3596411, 7607012, 16120249, 34215382, 72726284, 154732914, 329467719, 702061540, 1496757080, 3192362462, 6811840986, 14538763224, 31037544146 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A204492

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +9*a(n-3) -5*a(n-4) -10*a(n-5) -7*a(n-6) -26*a(n-7) +18*a(n-8) -13*a(n-9) +58*a(n-10) -4*a(n-11) +22*a(n-12) -26*a(n-13) -11*a(n-14) -16*a(n-15) +a(n-16) +6*a(n-17) +6*a(n-18) -3*a(n-19) for n>28

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A281062 A020241 A065903 * A062680 A251291 A120564

Adjacent sequences:  A204485 A204486 A204487 * A204489 A204490 A204491

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2012

STATUS

approved

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Last modified June 19 00:55 EDT 2019. Contains 324217 sequences. (Running on oeis4.)