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A210120
Number of (n+1)X4 0..3 arrays with every 2X2 subblock having two or four distinct values, and new values 0..3 introduced in row major order
1
265, 5587, 122093, 2737637, 62169169, 1421103679, 32591746591, 748700150743, 17213440909551, 395919930613433, 9108294781646229, 209561684217190855, 4821800888945436111, 110947619431688103759, 2552891640308208556991
OFFSET
1,1
COMMENTS
Column 3 of A210125
LINKS
FORMULA
Empirical: a(n) = 49*a(n-1) -776*a(n-2) +3750*a(n-3) +14056*a(n-4) -142120*a(n-5) -40107*a(n-6) +1691155*a(n-7) -89248*a(n-8) -8106546*a(n-9) +124804*a(n-10) +16077560*a(n-11) +19696*a(n-12) -11388288*a(n-13) +186112*a(n-14) +546816*a(n-15)
EXAMPLE
Some solutions for n=4
..0..0..1..0....0..1..0..0....0..1..1..0....0..1..1..0....0..0..1..2
..2..0..1..0....0..1..0..1....0..0..0..0....0..0..0..1....0..3..2..1
..0..2..3..2....1..0..1..0....0..2..2..2....0..1..0..0....1..2..2..2
..1..3..2..3....2..3..2..3....3..1..1..1....0..1..1..0....1..1..1..1
..0..2..3..2....2..2..2..2....1..1..2..1....0..1..0..0....1..0..0..0
CROSSREFS
Sequence in context: A094795 A023043 A211719 * A266308 A278141 A091676
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 17 2012
STATUS
approved