OFFSET
1,5
COMMENTS
Table starts
.1...1....1.....1......1........1.........1...........1............1
.1...5....7....18.....31.......65.......130.........253..........519
.1...7....7....19.....35.......95.......225.........575.........1563
.1..18...19....56....203......672......2168........7287........25652
.1..31...35...203...1301.....5953.....27614......144519.......776608
.1..65...95...672...5953....43848....310762.....2373454.....19198301
.1.130..225..2168..27614...310762...3273425....36840985....436133886
.1.253..575..7287.144519..2373454..36840985...616964357..10746198229
.1.519.1563.25652.776608.19198301.436133886.10746198229.279529477217
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) -4*a(n-4) for n>5
k=3: [order 19] for n>20
k=4: [order 71] for n>72
EXAMPLE
Some solutions for n=5 k=4
..0..0..1..0. .0..0..1..1. .0..0..1..0. .0..0..0..0. .0..0..1..0
..0..1..1..1. .0..0..1..1. .1..0..1..1. .0..1..1..0. .1..0..0..0
..1..0..0..0. .0..0..1..1. .1..1..0..0. .1..0..1..0. .1..1..1..0
..1..1..1..0. .0..0..0..0. .0..0..0..0. .1..0..1..0. .0..0..0..1
..1..0..1..1. .0..0..0..0. .0..0..0..0. .1..1..0..0. .1..0..1..1
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Feb 24 2018
STATUS
approved