OFFSET
1,2
COMMENTS
Table starts
....1........2.........5..........14...........41..........122...........365
....2.......14........91.........600.........4039........27212........183195
....5.......91.......388........2754........15543........95045........565516
...14......600......2754.......31752.......237031......2109626......17495647
...41.....4039.....15543......237031......2091092.....22779237.....235194056
..122....27212.....95045.....2109626.....22779237....299676213....3900134833
..365...183195....565516....17495647....235194056...3900134833...64606412468
.1094..1233336...3403942...148941378...2461439740..50732580694.1061812396215
.3281..8303647..20376721..1259597639..25939234980.672441825967
.9842.55905604.122289647.10659570010.271794661137
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..112
FORMULA
Empirical for column k:
k=1: a(n) = 4*a(n-1) -3*a(n-2).
k=2: a(n) = 8*a(n-1) -11*a(n-2) +20*a(n-3) -24*a(n-4) +8*a(n-5).
k=3: [order 16] for n > 18.
k=4: [order 41] for n > 45.
EXAMPLE
Some solutions for n=4, k=4
..0..1..2..1. .0..1..1..0. .0..0..0..1. .0..1..0..0. .0..0..0..1
..1..0..0..2. .0..0..0..0. .1..0..0..0. .1..1..1..1. .0..0..0..0
..1..0..0..0. .0..0..0..1. .0..1..0..0. .1..1..1..1. .1..0..0..0
..2..0..0..2. .1..1..1..1. .1..1..1..2. .1..1..1..2. .1..0..0..0
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Feb 05 2017
STATUS
approved