OFFSET
1,1
COMMENTS
Row 3 of A223987
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/3629463552000)*n^18 + (1/44808192000)*n^17 + (10403/10461394944000)*n^16 + (10537/373621248000)*n^15 + (2915977/5230697472000)*n^14 + (6071381/747242496000)*n^13 + (748919/8211456000)*n^12 + (23111713/28740096000)*n^11 + (409218107/73156608000)*n^10 + (320706361/10450944000)*n^9 + (107018740483/804722688000)*n^8 + (467745209/1026432000)*n^7 + (10942630223/8895744000)*n^6 + (239853259979/93405312000)*n^5 + (882554800469/217945728000)*n^4 + (6093492161/1297296000)*n^3 + (4200944633/1029188160)*n^2 + (1784593/1021020)*n + 1
EXAMPLE
Some solutions for n=3
..0..2..2....0..0..3....0..1..1....1..2..0....2..1..1....0..1..0....0..1..1
..0..2..2....0..0..3....1..1..3....1..2..1....2..2..1....1..2..0....1..2..1
..3..2..2....2..3..3....3..3..3....1..2..1....3..3..2....3..2..2....1..3..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 30 2013
STATUS
approved