OFFSET
1,2
COMMENTS
Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 3's, every 3 is next to 3 0's, every 4 is next to 4 4's
Table starts
..1.....2.......3..........4............6...............9................13
..2.....5......11.........34..........101.............299...............890
..3....11......76........408.........2025...........10548.............55431
..4....34.....408.......3394........30971..........299031...........2810070
..6...101....2025......30971.......546956.........9357578.........155701871
..9...299...10548.....299031......9357578.......279754939........8471917814
.13...890...55431....2810070....155701871......8471917814......465819437152
.19..2643..289038...26244524...2639528950....259951215394....25583402376768
.28..7855.1506376..246996575..44828048153...7909511305426..1398455518363119
.41.23340.7857827.2321651409.758613680168.240483051204609.76661027104639150
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..220
EXAMPLE
Some solutions for n=6 k=4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..1..1
..3..0..1..1....1..1..3..0....1..1..0..0....1..0..0..1....0..1..0..0
..0..3..0..0....0..3..0..3....0..3..0..3....1..0..3..1....0..1..3..0
..0..1..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..3..0..3
..0..1..0..0....0..3..0..3....0..0..3..0....0..0..1..0....1..0..0..0
..0..0..1..1....0..1..1..0....0..1..1..0....0..0..1..0....1..0..3..0
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Oct 05 2011
STATUS
approved