OFFSET
1,8
COMMENTS
Table starts
.0...0....0.....0.......0.........0...........0............0..............0
.0...1....2.....4.......9........19..........41...........88............189
.0...2....3....11......32.......102.........330.........1059...........3418
.0...4...11....36.....179.......735........3482........15986..........74347
.0...9...32...179....1536.....10374.......78932.......592064........4449947
.0..19..102...735...10374....116954.....1413931.....17336190......210669938
.0..41..330..3482...78932...1413931....27354464....538564737....10457318118
.0..88.1059.15986..592064..17336190...538564737..16992197390...534677180915
.0.189.3418.74347.4449947.210669938.10457318118.534677180915.27071152148341
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..219
FORMULA
Empirical for column k:
k=1: a(n) = a(n-1)
k=2: a(n) = a(n-1) +2*a(n-2) +a(n-3)
k=3: [order 15]
k=4: [order 56] for n>57
EXAMPLE
Some solutions for n=5 k=4
..0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..0..0. .0..0..1..1
..0..0..1..1. .0..1..1..1. .0..1..1..1. .0..1..1..0. .0..1..1..1
..0..0..1..0. .1..0..0..1. .0..1..1..1. .0..1..0..1. .0..0..0..0
..1..1..0..0. .1..0..0..1. .0..0..0..1. .0..0..1..1. .0..0..0..0
..1..0..0..0. .1..1..1..1. .0..0..1..1. .0..1..1..1. .0..0..0..0
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Mar 12 2018
STATUS
approved