OFFSET
1,2
COMMENTS
Table starts
...1.....2......4........7.........12...........21.............37
...2.....6.....13.......28.........60..........129............277
...4....13.....42......126........387.........1180...........3606
...7....28....126......524.......2229.........9425..........39905
..12....60....387.....2229......13322........78661.........466288
..21...129...1180.....9425......78661.......647252........5350080
..37...277...3606....39905.....466288......5350080.......61758332
..65...595..11012...168925....2760690.....44159095......711479843
.114..1278..33636...715072...16350693....364647622.....8201909757
.200..2745.102733..3027049...96830726...3010723330....94531063074
.351..5896.313781.12813931..573456240..24858935864..1089590912023
.616.12664.958384.54243509.3396136349.205253857220.12558669019786
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..337
FORMULA
Zeilberger's Maple code (see links in A228285) would presumably give recurrences for the columns of this array. - N. J. A. Sloane, Aug 22 2013
EXAMPLE
Some solutions for n=3 k=4
..0..0..0..0....1..0..0..1....0..0..1..0....0..0..1..0....0..0..0..1
..0..1..0..0....0..0..0..0....1..0..0..0....0..0..0..0....0..1..0..0
..0..0..0..0....0..1..0..1....0..0..0..1....1..0..0..1....0..0..0..0
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Nov 26 2012
STATUS
approved