OFFSET
1,8
COMMENTS
Table starts
.0...0.....0........0..........0............0...............0.................0
.0...1.....3........6.........17...........41.............104...............261
.0...3.....9.......31........166..........752............3739.............18300
.0...6....31......220.......2034........17565..........160089...........1456436
.0..17...166.....2034......37283.......621694........10759709.........186196755
.0..41...752....17565.....621694.....19604624.......648002718.......21337630973
.0.104..3739...160089...10759709....648002718.....40708113490.....2548695927399
.0.261.18300..1456436..186196755..21337630973...2548695927399...303433045764806
.0.655.90313.13302816.3228302388.704140369456.159913303887571.36196880526512847
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..180
FORMULA
Empirical for column k:
k=1: a(n) = a(n-1)
k=2: a(n) = a(n-1) +3*a(n-2) +2*a(n-3)
k=3: [order 13] for n>15
k=4: [order 37] for n>38
EXAMPLE
Some solutions for n=5 k=4
..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0
..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..1..0. .0..0..0..0
..0..0..0..0. .0..0..0..0. .0..0..0..0. .1..1..1..1. .0..0..0..0
..1..1..1..0. .0..1..1..1. .1..1..1..1. .1..1..1..1. .1..0..1..1
..1..1..1..1. .1..1..1..1. .1..1..1..1. .1..1..1..1. .1..1..1..1
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Feb 12 2018
STATUS
approved