OFFSET
1,2
COMMENTS
Table starts
.0.....20........92........248..........520...........940...........1540
.0.....80.......520.......1830.........4750.........10250..........19530
.0....212......2232......11008........36952.........98052.........221984
.0....594......9898......67852.......293464........955602........2567334
.0...1928.....50592.....473034......2591502......10217182.......32233938
.0...6780....270848....3397130.....23380862.....111101654......410475622
.0..23674...1432402...24220966....210222830....1206988576.....5230842688
.0..80750...7469120..171351382...1882624856...13090995142....66651385442
.0.271000..38883992.1214558880..16911040968..142480007436...852399648492
.0.909282.203526914.8651325238.152565274262.1556876199472.10942076565344
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..544
FORMULA
Empirical for rows:
T(1,k) = (16/3)*k^3 - 6*k^2 + (2/3)*k
T(2,k) = (115/12)*k^4 - (65/6)*k^3 + (65/12)*k^2 - (25/6)*k
T(3,k) = (88/5)*k^5 - (109/3)*k^4 + 44*k^3 - (107/3)*k^2 + (52/5)*k
T(4,k) = (5887/180)*k^6 - (5813/60)*k^5 + (6083/36)*k^4 - (2191/12)*k^3 + (9119/90)*k^2 - (353/15)*k
T(5,k) = (19328/315)*k^7 - (18373/90)*k^6 + (18602/45)*k^5 - (20887/36)*k^4 + (46687/90)*k^3 - (48359/180)*k^2 + (12499/210)*k
T(6,k) = (259723/2240)*k^8 - (2162653/5040)*k^7 + (1479629/1440)*k^6 - (642659/360)*k^5 + (6107509/2880)*k^4 - (1200571/720)*k^3 + (3930541/5040)*k^2 - (22719/140)*k
T(7,k) = (124952/567)*k^9 - (282778/315)*k^8 + (4520071/1890)*k^7 - (849277/180)*k^6 + (731309/108)*k^5 - (629357/90)*k^4 + (55560059/11340)*k^3 - (870757/420)*k^2 + (50299/126)*k
EXAMPLE
Some solutions for n=4 k=3
..1....2...-2...-2....1....3....0....0....3....0...-2...-1...-2....3...-3....1
.-2...-3....1...-3....3....1....2....3....0....3....3...-3...-3....0...-3....3
..3...-3...-3....0....2...-3....3....1...-2....2....1....2....2...-2....2....0
..0...-2...-1....2...-1...-3....0....0...-3....0...-3....0....2....3....2...-2
.-1....3....2....2....0....0...-2....1....1....1...-2...-1....0....1....0....3
..0....2....0....0...-2...-1....0...-3....0...-3....3....2....1...-3....3...-2
.-1....1....3....1...-3....3...-3...-2....1...-3....0....1....0...-2...-1...-3
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Nov 17 2011
STATUS
approved