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A241109 Number of nX3 0..2 arrays with no element equal to exactly three horizontal or vertical neighbors, with new values 0..2 introduced in row major order 1
5, 113, 2612, 60340, 1394492, 32228144, 744822776, 17213554688, 397821442776, 9194027810904, 212482632363880, 4910673535536216, 113490285320567816, 2622867264324958968, 60616930046792933096, 1400914281204947257016 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A241114

LINKS

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

FORMULA

Empirical: a(n) = 21*a(n-1) +48*a(n-2) +18*a(n-3) +16*a(n-4) -256*a(n-5) -636*a(n-6) -104*a(n-7) +560*a(n-8) +416*a(n-9) +64*a(n-10) -96*a(n-11) -64*a(n-12) for n>13

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A086805 A163014 A199650 * A208317 A279836 A279838

Adjacent sequences:  A241106 A241107 A241108 * A241110 A241111 A241112

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 16 2014

STATUS

approved

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Last modified November 27 20:49 EST 2021. Contains 349395 sequences. (Running on oeis4.)