OFFSET
1,1
COMMENTS
Table starts
....15......28.........66...........144.............336................752
....28.....104........408..........1616............6432..............25664
....66.....408.......2988.........20640..........149120............1050624
...144....1616......20640........262368.........3364544...........43139520
...336....6432.....149120.......3364544........78731136.........1806815040
...752...25664....1050624......43139520......1806815040........75601620736
..1752..102528....7557696.....553773760.....42196917280......3173584196608
..3936..409856...53547904....7110140800....972415126144....133184053106688
..9168.1638912..384685440...91312361088..22683600827456...5592572908886016
.20608.6554624.2730236928.1172796624128.523428338294528.234829512186605568
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..337
FORMULA
Empirical for column k:
k=1: a(n) = 6*a(n-2) -4*a(n-4)
k=2: a(n) = 6*a(n-1) -8*a(n-2) for n>3
k=3: a(n) = 70*a(n-2) -1024*a(n-4) +2832*a(n-6) -1792*a(n-8) +128*a(n-10)
k=4: [order 11] for n>12
k=5: [order 32]
k=6: [order 44] for n>45
EXAMPLE
Some solutions for n=3 k=4
..2..9.12..9....2..9.11..9....7..4..1..0....0..1..3..5....9..2..0..2
..9..2..9.11....9.12..9.12....4..8..4..1....1..3..6..3....2.10..2.10
.12..9.12..9...11..9.12..9....7..4..8..4....0..1..3..1...10..2.10.13
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Mar 20 2013
STATUS
approved