OFFSET
1,2
COMMENTS
Table starts
..1....2.......3.........4............7............10............15
..2....5......14........24...........77...........182...........397
..3...14......77.......235.........1381..........5566.........21413
..4...24.....235......1304........13648.........98837........692520
..7...77....1381.....13648.......257243.......3366314......43820839
.10..182....5566.....98837......3366314......80283637....1935005419
.15..397...21413....692520.....43820839....1935005419...85908009949
.24.1164..114951...6686074....766539340...62076655091.5128168982319
.35.2626..447479..47001423...9754760605.1450984782112
.54.6439.1942846.368795251.139442821024
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..112
FORMULA
Empirical for column k:
k=1: a(n) = a(n-2) +2*a(n-3)
k=2: [order 15]
EXAMPLE
Some solutions for n=4 k=4
..2..1..1..2....2..2..2..2....2..1..2..1....2..2..2..1....2..2..2..1
..3..1..3..3....3..3..0..0....3..3..0..1....3..3..0..1....3..3..0..1
..2..0..0..1....2..2..0..0....2..2..0..0....2..2..2..0....2..2..0..0
..3..3..2..2....3..1..0..2....3..3..0..0....3..3..0..0....3..1..0..3
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Apr 04 2014
STATUS
approved