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A206389 T(n,k)=Number of nXk 0..6 arrays with no element equal to another within a city block distance of two, and new values 0..6 introduced in row major order 6
1, 1, 1, 1, 1, 1, 2, 4, 4, 2, 5, 33, 55, 33, 5, 15, 380, 1368, 1368, 380, 15, 52, 4801, 34442, 67716, 34442, 4801, 52, 202, 62004, 868994, 3328979, 3328979, 868994, 62004, 202, 855, 804833, 21916090, 164270604, 319902496, 164270604, 21916090, 804833, 855 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,7
COMMENTS
Table starts
...1......1.........1..........2...........5..........15............52
...1......1.........4.........33.........380........4801.........62004
...1......4........55.......1368.......34442......868994......21916090
...2.....33......1368......67716.....3328979...164270604....8094257014
...5....380.....34442....3328979...319902496.30809397399.2965468376203
..15...4801....868994..164270604.30809397399
..52..62004..21916090.8094257014
.202.804833.552801398
LINKS
EXAMPLE
Some solutions for n=4 k=3
..0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
..2..3..0....2..3..0....3..4..0....2..3..4....2..3..4....3..4..5....2..3..4
..4..5..1....4..5..6....1..2..5....4..5..1....1..5..6....5..2..1....4..5..6
..6..2..4....6..2..1....6..0..1....6..0..2....6..2..0....1..6..4....6..0..1
CROSSREFS
Column 1 is A056272(n-2)
Column 2 is A198900(n-1)
Sequence in context: A160163 A263442 A206396 * A206503 A323938 A122592
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Feb 07 2012
STATUS
approved

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Last modified April 14 15:45 EDT 2024. Contains 371665 sequences. (Running on oeis4.)