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A210408 Number of (n+1)X4 0..3 arrays with every 2X2 subblock having three or four distinct values, and new values 0..3 introduced in row major order 1
864, 80496, 7380816, 677993552, 62266883792, 5718722907600, 525218223843536, 48237041019306960, 4430181461077005264, 406876281233712454096, 37368290575302443698896, 3431974791902387709770704 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A210413

LINKS

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

FORMULA

Empirical: a(n) = 81*a(n-1) +1151*a(n-2) -13041*a(n-3) -117154*a(n-4) +478740*a(n-5) +445664*a(n-6) -2873152*a(n-7) +2422784*a(n-8) -196608*a(n-9)

EXAMPLE

Some solutions for n=4

..0..0..0..0....0..0..0..1....0..0..0..0....0..0..1..0....0..0..1..1

..1..2..1..3....1..2..1..2....1..2..3..2....1..2..1..2....1..2..2..3

..1..0..0..1....2..0..1..3....2..0..2..0....0..0..1..0....3..0..3..0

..0..2..3..2....1..3..0..0....3..0..1..2....3..2..1..2....0..1..3..1

..1..1..0..3....1..0..2..3....3..2..3..1....0..0..3..1....3..2..1..0

CROSSREFS

Sequence in context: A299220 A300034 A064321 * A299413 A300055 A082243

Adjacent sequences: A210405 A210406 A210407 * A210409 A210410 A210411

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 21 2012

STATUS

approved

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Last modified February 9 05:05 EST 2023. Contains 360153 sequences. (Running on oeis4.)