login
A183362
T(n,k)=One quarter the number of nXk 1..4 arrays with no two neighbors of any element equal to each other
10
1, 4, 4, 12, 36, 12, 36, 144, 144, 36, 108, 576, 432, 576, 108, 324, 2304, 1296, 1296, 2304, 324, 972, 9216, 3888, 3600, 3888, 9216, 972, 2916, 36864, 11664, 9216, 9216, 11664, 36864, 2916, 8748, 147456, 34992, 24336, 24192, 24336, 34992, 147456, 8748
OFFSET
1,2
COMMENTS
Table starts
.....1.......4.....12......36.....108.....324.....972.....2916.....8748
.....4......36....144.....576....2304....9216...36864...147456...589824
....12.....144....432....1296....3888...11664...34992...104976...314928
....36.....576...1296....3600....9216...24336...63504...166464...435600
...108....2304...3888....9216...24192...57600..137088...331776...802944
...324....9216..11664...24336...57600..147456..331776...746496..1679616
...972...36864..34992...63504..137088..331776..829440..1806336..3852288
..2916..147456.104976..166464..331776..746496.1806336..4460544..9437184
..8748..589824.314928..435600..802944.1679616.3852288..9437184.23003136
.26244.2359296.944784.1140624.1937664.3873024.8294400.19501056.47775744
LINKS
EXAMPLE
Some solutions for 6X5 with a(1,1)=1
..1..1..3..2..2....1..1..3..2..1....1..1..4..2..3....1..1..3..2..4
..4..4..3..1..1....2..2..4..4..3....3..3..4..1..3....4..4..3..1..1
..3..2..2..4..4....4..3..1..1..3....4..2..2..1..4....3..2..2..4..3
..3..1..1..3..2....4..3..2..2..4....4..1..3..3..4....3..1..1..4..3
..2..4..4..3..1....1..1..4..3..1....3..1..4..2..2....2..4..3..2..2
..1..3..2..2..1....2..2..4..3..1....3..2..4..1..3....1..4..3..1..4
CROSSREFS
Column 1 is A003946(n-1)
Sequence in context: A359709 A228612 A038804 * A353615 A088838 A367688
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Jan 04 2011
STATUS
approved