OFFSET
1,1
COMMENTS
Table starts
.....2......8.......30........102..........348...........1172.............3956
.....8.....28......244........800.........6576..........21076...........173428
....30....244.....2106......16536.......130446........1025430..........8053490
...102....800....16536.....121382......2382398.......17497342........342031378
...348...6576...130446....2382398.....43853402......801845362......14669811856
..1172..21076..1025430...17497342....801845362....13663471254.....625553036008
..3956.173428..8053490..342031378..14669811856...625553036008...26681634560690
.13326.554040.63237238.2508344646.268320990890.10652997961328.1137681116923966
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..219
FORMULA
Empirical for column k:
k=1: a(n) = 3*a(n-1) +3*a(n-2) -6*a(n-3) +a(n-5)
k=2: a(n) = 31*a(n-2) -126*a(n-4) +42*a(n-6) +79*a(n-8) -a(n-10) +8*a(n-12)
k=3: [order 22]
k=4: [order 50]
EXAMPLE
Some solutions for n=2 k=4
..0..x..2..x..2..x..0....0..x..2..x..2..x..2....0..x..0..x..2..x..0
..x..1..x..0..x..1..x....x..1..x..0..x..0..x....x..1..x..0..x..1..x
..0..x..1..x..2..x..0....0..x..0..x..1..x..2....1..x..2..x..1..x..1
..x..2..x..0..x..1..x....x..2..x..2..x..1..x....x..2..x..1..x..2..x
..1..x..1..x..0..x..0....1..x..1..x..0..x..0....1..x..0..x..0..x..1
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Oct 28 2013
STATUS
approved