OFFSET
1,1
COMMENTS
Table starts
....7.....12........26..........48............104..............192
...12.....40.......136.........464...........1584.............5408
...26....136.......868........4720..........29912...........163168
...48....464......4720.......47872.........486016..........4934272
..104...1584.....29912......486016........9210784........150006016
..192...5408....163168.....4934272......150006016.......4565849088
..416..18464...1033328....50097024.....2844612736.....139114196992
..768..63040...5638336...508632832....46345527296....4240305623040
.1664.215232..35704800..5164146176...878977950208..129279082045440
.3072.734848.194827648.52431620096.14321836797952.3941937218551808
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..544
FORMULA
Empirical for column k:
k=1: a(n) = 4*a(n-2) for n>3
k=2: a(n) = 4*a(n-1) -2*a(n-2)
k=3: a(n) = 38*a(n-2) -120*a(n-4) +32*a(n-6)
k=4: a(n) = 14*a(n-1) -36*a(n-2) -40*a(n-3) +88*a(n-4) +32*a(n-5) -32*a(n-6)
k=5: a(n) = 392*a(n-2) -26768*a(n-4) +353408*a(n-6) -1274624*a(n-8) +1441792*a(n-10) -307200*a(n-12) for n>13
k=6: [order 18]
k=7: [order 36]
EXAMPLE
Some solutions for n=3 k=4
..5..2..6..2....5..2..0..1....1..3..1..0....1..0..1..4....0..2..6..2
..2..0..2..6....2..6..2..0....3..1..4..1....4..1..4..1....1..0..2..0
..0..1..0..2....6..2..0..1....1..4..1..0....1..3..1..4....4..1..0..2
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Mar 20 2013
STATUS
approved