OFFSET
1,7
COMMENTS
Table starts
..0...0....1......3.......6........10..........15............21.............28
..0...0....1.....13......41........85.........145...........221............313
..1...1....1.....33.....266.......851........1836..........3221...........5006
..3..13...33.....68....1247......8487.......27905.........62977.........114433
..6..41..266...1247....4657.....67537......433401.......1481460........3510600
.10..85..851...8487...67537....432842.....5672484......36112108......129234988
.15.145.1836..27905..433401...5672484....60650883.....766674140.....4970634131
.21.221.3221..62977.1481460..36112108...766674140...13458882036...170090480091
.28.313.5006.114433.3510600.129234988..4970634131..170090480091..4857082197177
.36.421.7191.182273.6637020.322183180.18692194423.1139074556531.62656851440792
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..480
FORMULA
Empirical for column k:
k=1: a(n) = (1/2)*n^2 - (3/2)*n + 1
k=2: a(n) = 8*n^2 - 44*n + 61 for n>2
k=3: a(n) = 200*n^2 - 1615*n + 3341 for n>4
k=4: a(n) = 8192*n^2 - 87808*n + 241153 for n>6
k=5: a(n) = 557568*n^2 - 7467372*n + 25553940 for n>8
k=6: a(n) = 63438848*n^2 - 1019729920*n + 4176308004 for n>10
k=7: a(n) = 12103190528*n^2 - 226960984822*n + 1081747760523 for n>12
EXAMPLE
Some solutions for n=4 k=4
..0..0..1..1....0..0..0..0....0..0..0..1....0..0..0..0....0..0..1..1
..0..1..1..1....0..0..0..0....0..0..0..1....0..0..0..1....0..1..1..1
..0..1..1..1....0..0..1..1....0..0..0..1....0..0..1..1....1..1..1..1
..0..1..1..1....0..1..1..1....0..0..1..1....0..0..1..1....1..1..1..1
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Dec 25 2014
STATUS
approved