OFFSET
1,1
COMMENTS
Table starts
..2.....3.......4..........7...........10............15.............24
..3....11......21.........67..........155...........353............998
..4....21......75........450.........1729..........7233..........36148
..7....67.....450.......5161........36398........271764........2492182
.10...155....1729......36398.......486179.......6436979......110122847
.15...353....7233.....271764......6436979.....169838571.....5145071133
.24...998...36148....2492182....110122847....5145071133...296413962369
.35..2256..139855...17380978...1403151574..121626491919.12947745036751
.54..5639..645733..143489019..20729739995.3384817934297
.83.14624.2919837.1182292032.314460587672
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..111
FORMULA
Empirical for column k:
k=1: a(n) = a(n-2) +2*a(n-3)
k=2: [order 15] for n>17
EXAMPLE
Some solutions for n=4 k=4
..3..2..3..3....3..3..2..3....2..2..3..2....3..3..2..3....3..2..3..3
..2..0..1..2....3..2..0..3....2..1..1..0....3..1..2..1....2..1..1..2
..3..1..2..1....2..0..2..0....3..1..2..1....2..2..2..2....3..3..2..0
..2..1..1..2....3..1..0..2....2..0..2..2....2..0..0..0....2..1..2..0
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Apr 04 2014
STATUS
approved