OFFSET
1,1
COMMENTS
Table starts
....3.......9........24..........60...........144.............336
....9......42.......174.........666..........2430............8586
...24.....174......1086........6300.........34890..........187224
...60.....666......6300.......55452........467190.........3819654
..144....2430.....34890......467190.......6000978........74914554
..336....8586....187224.....3819654......74914554......1430057208
..768...29646....982086....30553014.....915847266.....26758514760
.1728..100602...5063964...240364746...11018667294....493042858032
.3840..336798..25764066..1866503592..130903914954...8974328440044
.8448.1115370.129678528.14342680944.1539375100362.161737670836314
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..420
FORMULA
Empirical for column k:
k=1: a(n) = 4*a(n-1) -4*a(n-2)
k=2: a(n) = 6*a(n-1) -9*a(n-2) for n>3
k=3: a(n) = 10*a(n-1) -29*a(n-2) +20*a(n-3) -4*a(n-4)
k=4: [order 6] for n>7
k=5: [order 10]
k=6: [order 14] for n>15
k=7: [order 26]
EXAMPLE
Some solutions for n=4 k=4
..2..1..0..0. .1..2..1..0. .0..0..0..0. .1..2..2..2. .0..0..0..1
..1..0..0..0. .0..1..0..0. .0..0..0..0. .2..1..2..2. .0..0..1..0
..2..0..1..0. .1..0..0..0. .1..0..0..0. .1..2..2..2. .0..0..0..1
..2..1..0..1. .0..0..1..1. .2..1..1..0. .0..2..2..2. .0..1..1..2
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Feb 09 2016
STATUS
approved