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A205258
Number of (n+2)X4 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..1 introduced in row major order
1
1814, 26185, 379283, 5487807, 79391891, 1148637735, 16618559061, 240437007466, 3478637408972, 50328870718111, 728157294220956, 10534967761052004, 152419740740110092, 2205206312498168603, 31904888800224330056
OFFSET
1,1
COMMENTS
Column 2 of A205264
LINKS
FORMULA
Empirical: a(n) = 12*a(n-1) +26*a(n-2) +147*a(n-3) +31*a(n-4) -1556*a(n-5) -3897*a(n-6) -651*a(n-7) +17307*a(n-8) +21426*a(n-9) -11130*a(n-10) -33322*a(n-11) -26057*a(n-12) -17028*a(n-13) +13934*a(n-14) +47659*a(n-15) +12966*a(n-16) +8775*a(n-17) -8902*a(n-18) -11055*a(n-19) +1056*a(n-20) -3955*a(n-21) +2305*a(n-22) -300*a(n-23) +322*a(n-24) -32*a(n-25) -24*a(n-26)
EXAMPLE
Some solutions for n=3
..0..0..1..0....0..1..1..1....0..1..1..1....0..0..1..1....0..0..1..0
..0..0..1..1....0..1..0..1....1..1..0..0....1..0..1..1....1..1..0..0
..1..0..0..0....0..1..1..0....0..0..0..1....0..0..0..0....0..0..0..0
..0..1..0..1....1..1..0..1....1..1..0..0....1..0..0..1....1..0..0..0
..0..0..1..0....1..0..1..0....1..0..0..1....1..1..0..1....0..1..1..0
CROSSREFS
Sequence in context: A252808 A238141 A058954 * A255732 A338166 A353807
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 24 2012
STATUS
approved