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

2, 25, 206, 1931, 16784, 151630, 1343560, 12046648, 107401612, 960610876, 8576723918, 76644197120, 684569775162, 6116039277778, 54633888067900, 488076198634430, 4360092827131800, 38950530867108738, 347957262094712236

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