OFFSET
1,2
COMMENTS
Table starts
....1.......2.........4.........11...........30............82...........224
....2.......9........42........205..........997..........4850.........23593
....4......42.......241.......1554.........9899.........63085........402077
...11.....205......1554......14106.......126267.......1121528.......9986376
...30.....997......9899.....126267......1599234......20029500.....251270618
...82....4850.....63085....1121528.....20029500.....346289502....6052621154
..224...23593....402077....9986376....251270618....6052621154..148137367471
..612..114769...2562733...88940022...3152475854..105777297118.3624578433814
.1672..558298..16334111..791997382..39530438497.1846875100200
.4568.2715861.104108376.7052519878.495721552160
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..112
FORMULA
Empirical for column k:
k=1: a(n) = 2*a(n-1) +2*a(n-2) for n>4
k=2: a(n) = 4*a(n-1) +4*a(n-2) +a(n-3) for n>4
k=3: [order 12] for n>16
k=4: [order 54] for n>57
EXAMPLE
Some solutions for n=4 k=4
..0..1..2..0. .0..0..1..0. .0..0..1..2. .0..1..0..1. .0..1..0..0
..2..0..1..2. .1..2..0..1. .2..1..0..1. .1..0..2..2. .1..2..1..2
..0..1..0..1. .1..2..1..0. .2..0..1..2. .2..1..0..0. .2..1..2..1
..2..0..2..2. .0..0..2..2. .1..2..0..0. .2..1..2..2. .0..0..1..0
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Jan 11 2017
STATUS
approved