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A206392 Number of nX4 0..5 arrays with no element equal to another within a city block distance of two, and new values 0..5 introduced in row major order 1
2, 25, 206, 1931, 16784, 151630, 1343560, 12046648, 107401612, 960610876, 8576723918, 76644197120, 684569775162, 6116039277778, 54633888067900, 488076198634430, 4360092827131800, 38950530867108738, 347957262094712236 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A206396

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-1) -32*a(n-2) -281*a(n-3) +1738*a(n-4) -1728*a(n-5) -9767*a(n-6) +21963*a(n-7) -7410*a(n-8) +5706*a(n-9) -19704*a(n-10) +6028*a(n-11) +2512*a(n-12) -2176*a(n-13) for n>15

EXAMPLE

Some solutions for n=4

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

..2..3..4..5....2..3..4..5....4..3..0..5....4..3..0..4....3..4..5..0

..4..5..0..1....1..5..0..1....5..2..4..1....1..2..5..1....1..0..3..1

..0..1..2..3....3..4..2..3....0..1..5..3....0..4..3..2....2..5..4..2

CROSSREFS

Sequence in context: A215298 A094218 A203767 * A074438 A068176 A131585

Adjacent sequences:  A206389 A206390 A206391 * A206393 A206394 A206395

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 07 2012

STATUS

approved

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Last modified September 27 13:46 EDT 2022. Contains 357062 sequences. (Running on oeis4.)