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A204277 Number of (n+2)X3 0..2 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..2 introduced in row major order 1
108, 274, 783, 1758, 5263, 14141, 29731, 93809, 248919, 573623, 1749927, 4584571, 10749287, 31949583, 84592247, 205786143, 596167847, 1572769159, 3909703655, 11160005367, 29583601447, 74984069415, 210919726503, 560126562599 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A204284

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) -3*a(n-2) +10*a(n-3) -44*a(n-4) +60*a(n-5) -30*a(n-6) -172*a(n-7) -152*a(n-8) +1224*a(n-9) -448*a(n-10) -656*a(n-11) +880*a(n-12) -2592*a(n-13) +2688*a(n-14) -768*a(n-15) for n>16

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A255084 A252337 A204284 * A138669 A304377 A202616

Adjacent sequences: A204274 A204275 A204276 * A204278 A204279 A204280

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 13 2012

STATUS

approved

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Last modified February 7 17:57 EST 2023. Contains 360128 sequences. (Running on oeis4.)