OFFSET
1,4
COMMENTS
Table starts
.0..1...2.....3......4........5.........6...........7.............8
.1..1...8....16.....24.......32........40..........48............56
.2..8..18....94....190......290.......390.........490...........590
.3.16..94...386...1729.....3577......5600........7648..........9696
.4.24.190..1729..12200....51496....109736......176872........246312
.5.32.290..3577..51496...608993...2526480.....5560676.......9241012
.6.40.390..5600.109736..2526480..49489706...206094186.....468856938
.7.48.490..7648.176872..5560676.206094186..6648891794...28101900201
.8.56.590..9696.246312..9241012.468856938.28101900201.1489334202216
.9.64.690.11744.316008.13153668.803577258.66058900101.6425402265448
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..480
FORMULA
Empirical for column k:
k=1: a(n) = n - 1
k=2: a(n) = 8*n - 16 for n>2
k=3: a(n) = 100*n - 310 for n>4
k=4: a(n) = 2048*n - 8736 for n>6
k=5: a(n) = 69696*n - 380952 for n>8
k=6: a(n) = 3964928*n - 26499968 for n>10
k=7: a(n) = 378224704*n - 2991671254 for n>12
EXAMPLE
Some solutions for n=4 k=4
..0..0..0..1....0..0..0..0....0..0..0..0....0..0..1..1....0..0..1..1
..1..1..1..1....0..0..0..1....0..0..1..1....0..1..1..2....0..0..1..2
..1..1..1..1....1..1..1..1....1..1..1..2....1..1..2..2....0..0..1..2
..1..1..2..2....1..1..1..2....1..1..1..2....2..2..2..2....0..0..1..2
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Dec 24 2014
STATUS
approved