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A210159 Number of (n+1)X3 0..3 arrays with every 2X2 subblock having two or three distinct values, and new values 0..3 introduced in row major order 1
148, 6977, 351482, 17864271, 908980864, 46257884813, 2354098130302, 119802073302399, 6096832015875652, 310273110797149253, 15790069903296057458, 803570464268447301967, 40894403574255214909720 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A210165
LINKS
FORMULA
Empirical: a(n) = 55*a(n-1) -186*a(n-2) -1230*a(n-3) +2723*a(n-4) +159*a(n-5) -1604*a(n-6) +468*a(n-7)
EXAMPLE
Some solutions for n=4
..0..1..0....0..1..0....0..0..1....0..0..0....0..0..0....0..0..0....0..0..0
..2..0..1....1..0..0....2..0..3....0..1..2....0..1..0....0..1..0....0..1..0
..0..2..0....1..0..2....3..0..1....2..1..1....2..2..1....0..1..1....1..2..1
..1..2..1....3..3..2....0..1..2....0..1..2....1..3..2....2..0..2....0..1..3
..3..1..0....1..0..3....1..1..0....2..2..1....0..1..1....0..1..0....1..3..3
CROSSREFS
Sequence in context: A224308 A224372 A185478 * A252770 A035822 A221349
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 18 2012
STATUS
approved

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Last modified July 24 12:13 EDT 2024. Contains 374583 sequences. (Running on oeis4.)