OFFSET
1,1
COMMENTS
Table starts
....4....8...15...26...42...64...93..130..176..232..299..378..470..576...697
....8...16...28...45...68...98..136..183..240..308..388..481..588..710...848
...16...32...53...80..114..156..207..268..340..424..521..632..758..900..1059
...32...64..100..144..196..257..328..410..504..611..732..868.1020.1189..1376
...64..128..188..256..337..428..530..644..771..912.1068.1240.1429.1636..1862
..128..256..354..451..568..705..854.1016.1192.1383.1590.1814.2056.2317..2598
..256..512..667..796..945.1134.1352.1584.1831.2094.2374.2672.2989.3326..3684
..512.1024.1256.1413.1574.1797.2088.2419.2766.3130.3512.3913.4334.4776..5240
.1024.2048.2365.2510.2645.2848.3175.3606.4090.4592.5113.5654.6216.6800..7407
.2048.4096.4454.4448.4476.4560.4824.5294.5912.6598.7304.8031.8780.9552.10348
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..9999
FORMULA
Empirical for column k:
k=1: a(n) = 2*a(n-1)
k=2: a(n) = 2*a(n-1)
k=3: a(n) = 2*a(n-1) -a(n-2) +2*a(n-3) -a(n-4)
k=4: a(n) = 2*a(n-1) -a(n-2) +3*a(n-4) -2*a(n-5)
k=5: a(n) = 2*a(n-1) -a(n-2) +4*a(n-5) -3*a(n-6)
k=6: a(n) = 2*a(n-1) -a(n-2) +5*a(n-6) -4*a(n-7)
k=7: a(n) = 2*a(n-1) -a(n-2) +6*a(n-7) -5*a(n-8)
Empirical for row n:
n=1: a(n) = (1/6)*n^3 + (1/2)*n^2 + (4/3)*n + 2
n=2: a(n) = (1/6)*n^3 + n^2 + (23/6)*n + 3
n=3: a(n) = (1/6)*n^3 + (3/2)*n^2 + (31/3)*n + 4
n=4: a(n) = (1/6)*n^3 + 2*n^2 + (143/6)*n + 6 for n>2
n=5: a(n) = (1/6)*n^3 + (5/2)*n^2 + (145/3)*n + 12 for n>3
n=6: a(n) = (1/6)*n^3 + 3*n^2 + (533/6)*n + 28 for n>4
n=7: a(n) = (1/6)*n^3 + (7/2)*n^2 + (454/3)*n + 64 for n>5
EXAMPLE
Some solutions for n=4 k=4
..1....1....0....0....0....0....0....1....0....0....1....0....1....0....0....0
..1....0....0....1....1....0....0....1....1....0....1....0....1....0....0....1
..1....0....1....1....1....0....1....0....0....0....1....1....0....1....0....1
..1....1....0....1....0....1....1....0....0....0....0....1....0....0....1....1
..0....1....0....0....0....1....1....1....0....1....1....1....1....0....1....1
..1....1....0....1....1....0....1....1....0....0....1....1....1....0....1....1
..1....0....0....1....1....1....1....1....1....1....1....0....1....0....1....0
..1....1....1....1....0....1....0....1....0....1....0....1....0....0....1....1
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Mar 13 2015
STATUS
approved