A210090 Number of (n+1)X4 0..2 arrays containing all values 0..2 with every 2X2 subblock having one or two distinct values, and new values 0..2 introduced in row major order

90, 2370, 57232, 1318221, 29356228, 639141361, 13698519779, 290324839303, 6103041497311, 127519984428456, 2652384495217319, 54979384455905446, 1136640525774010786, 23451581988184791928, 483112213807378047958

Offset

1,1

Comments

Column 3 of A210095

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 40*a(n-1) -446*a(n-2) +766*a(n-3) +4061*a(n-4) -6645*a(n-5) -8411*a(n-6) +13005*a(n-7) -317*a(n-8) -2372*a(n-9) +320*a(n-10)

Example

Some solutions for n=4
..0..0..1..2....0..0..0..0....0..1..0..1....0..0..0..0....0..0..0..1
..0..0..1..2....0..0..0..0....1..0..0..0....1..0..1..1....2..2..0..0
..0..0..1..2....1..0..0..1....1..0..2..2....1..1..0..0....1..2..0..1
..0..0..1..1....0..0..0..0....1..0..2..1....1..0..1..1....2..2..0..0
..2..0..0..1....2..0..1..0....1..0..2..1....1..1..1..2....0..2..2..0

Crossrefs

Sequence in context: A257040 A008393 A055603 * A109124 A013359 A013355

Adjacent sequences: A210087 A210088 A210089 * A210091 A210092 A210093

Keyword

nonn

Author

R. H. Hardin Mar 17 2012

Status

approved