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A210047
Number of (n+1)X4 0..2 arrays containing all values 0..2 with every 2X2 subblock having two distinct values, and new values 0..2 introduced in row major order
1
75, 1271, 20871, 332891, 5169813, 78792305, 1184416509, 17624469579, 260264902127, 3821147552379, 55850881366677, 813499248661201, 11816892350999277, 171285288093188555, 2478576674689280655
OFFSET
1,1
COMMENTS
Column 3 of A210052
LINKS
FORMULA
Empirical: a(n) = 24*a(n-1) -89*a(n-2) -977*a(n-3) +3094*a(n-4) +13063*a(n-5) -28268*a(n-6) -71414*a(n-7) +90536*a(n-8) +163472*a(n-9) -114928*a(n-10) -148256*a(n-11) +54080*a(n-12) +35328*a(n-13) -9216*a(n-14)
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..1..0..1....0..1..0..1....0..0..0..1....0..0..0..0
..0..1..1..0....1..0..0..0....1..0..0..0....2..2..0..0....0..1..0..2
..0..0..1..0....1..0..2..2....0..0..1..0....1..2..0..1....0..1..0..2
..1..0..0..0....1..0..2..1....1..1..0..0....2..2..0..0....1..0..0..2
..1..0..2..0....1..0..2..1....1..0..0..2....0..2..2..0....1..0..2..0
CROSSREFS
Sequence in context: A218094 A285920 A293581 * A210505 A285856 A202257
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 16 2012
STATUS
approved