OFFSET
1,4
COMMENTS
Table starts
....0........0...........2..............4..............14...............40
....0........0..........16............152............1536............13776
....2.......16.........664..........16092..........384180..........8854880
....4......152.......16092........1079496........73482624.......4808164964
...14.....1536......384180.......73482624.....14012963052....2584102824124
...40....13776.....8854880.....4808164964...2584102824124.1348916804333952
..120...118664...198179722...306703795184.466109368455794
..352...991616..4349449420.19222109104916
.1032..8109024.94030021118
.3008.65252928
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..71
FORMULA
Empirical for column k:
k=1: a(n) = 4*a(n-1) -8*a(n-3) -4*a(n-4) for n>5
k=2: [order 10]
k=3: [order 34] for n>35
EXAMPLE
Some solutions for n=3 k=4
..0..0..1..0. .0..1..2..0. .0..1..2..1. .0..1..0..1. .0..1..2..0
..0..1..2..1. .0..0..2..1. .2..2..0..0. .0..2..1..2. .1..2..0..0
..2..2..0..1. .2..1..1..2. .1..2..1..0. .1..0..1..1. .0..2..2..1
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Dec 09 2016
STATUS
approved