OFFSET
1,5
COMMENTS
Table starts
.1...1...1....1.....1.....1......1.......1........1.........1.........1
.1...4...7...13....26....49.....99.....194......387.......773......1538
.1...7..13...21....29....58....120.....250......515......1100......2302
.1..13..21...26....70...139....287.....625.....1484......3197......7321
.1..26..29...70...189...468...1446....3769....11196.....32714.....93764
.1..49..58..139...468..1916...5428...18126....66146....225773....773853
.1..99.120..287..1446..5428..20777...86855...376999...1555947...6605299
.1.194.250..625..3769.18126..86855..476965..2572180..13348093..71288692
.1.387.515.1484.11196.66146.376999.2572180.16700783.105494740.692447139
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..220
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 18] for n>19
k=4: [order 70] for n>71
EXAMPLE
Some solutions for n=5 k=4
..0..1..0..0. .0..0..0..0. .0..0..1..0. .0..1..0..0. .0..1..1..0
..1..1..0..0. .1..1..1..1. .0..0..1..1. .1..0..1..1. .0..1..0..1
..1..0..0..0. .1..0..0..1. .0..0..0..1. .0..1..1..1. .1..0..0..1
..1..0..1..1. .1..0..0..1. .1..1..0..1. .1..0..1..1. .0..1..0..1
..0..1..1..0. .1..0..0..1. .0..1..1..0. .0..1..0..0. .0..1..1..0
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Jul 08 2018
STATUS
approved