OFFSET
1,1
COMMENTS
Table starts
...8..20...56..164..488..1460..4376..13124..39368.118100..354296.1062884
..12..20...32...52...84...136...220....356....576....932....1508....2440
..24..56..134..344..888..2318..6056..15848..41478.108584..284264..744206
..36..60...96..156..252...408...660...1068...1728...2796....4524....7320
..72.168..402.1032.2664..6954.18168..47544.124434.325752..852792.2232618
.108.180..288..468..756..1224..1980...3204...5184...8388...13572...21960
.216.504.1206.3096.7992.20862.54504.142632.373302.977256.2558376.6697854
.324.540..864.1404.2268..3672..5940...9612..15552..25164...40716...65880
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..5596
FORMULA
Empirical for column k:
k=1: a(n) = 3*a(n-2)
k=2..7: a(n) = 3*a(n-2) for n>3
Empirical for row n:
n=1: a(k)=4*a(k-1)-3*a(k-2)
n=2,4,6: a(k)=a(k-1)+a(k-2)
n=3,5,7: a(k)=3*a(k-1)-3*a(k-3)+a(k-4)
EXAMPLE
Some solutions for n=4 k=3
..0..1..0..0....0..1..0..1....0..0..0..0....0..1..1..1....0..0..0..0
..0..1..0..1....0..0..0..0....1..1..1..1....0..1..0..1....1..0..1..0
..1..0..1..0....0..0..0..0....1..1..1..1....1..0..1..0....0..1..0..1
..1..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0....0..0..0..0
..0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1....0..0..0..0
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Feb 23 2012
STATUS
approved