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A204481
Number of (n+2)X8 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
24718, 29959, 9290, 11364, 11338, 18410, 47369, 133889, 481694, 1808046, 6765672, 25621498, 97131639, 368034455, 1395284106, 5289949408, 20055106670, 76034602906, 288269180957, 1092909631093, 4143534785206, 15709333424602
OFFSET
1,1
COMMENTS
Column 6 of A204483
LINKS
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..1..1..2..1..1..3....0..1..1..0..1..0..2..1....0..1..0..0..2..2..1..1
..0..0..1..1..2..1..1..1....0..1..1..0..1..0..2..1....0..1..0..0..2..2..2..2
..0..0..1..1..2..1..1..3....0..1..1..0..1..0..2..1....0..1..0..0..2..2..0..2
..0..0..1..1..2..1..1..3....0..1..1..0..1..0..2..1....0..0..0..0..2..2..0..2
..0..0..1..1..2..1..1..3....0..1..1..0..1..0..2..1....1..3..0..0..2..2..0..2
CROSSREFS
Sequence in context: A189184 A321148 A216069 * A052356 A334024 A184093
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 2012
STATUS
approved