OFFSET
1,1
COMMENTS
Row 7 of A249982
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +5*a(n-2) -12*a(n-3) -9*a(n-4) +30*a(n-5) +5*a(n-6) -40*a(n-7) +5*a(n-8) +30*a(n-9) -9*a(n-10) -12*a(n-11) +5*a(n-12) +2*a(n-13) -a(n-14)
Empirical for n mod 2 = 0: a(n) = (459901/26880)*n^7 + (238219/1920)*n^6 + (682979/1920)*n^5 + (30971/64)*n^4 + (124069/480)*n^3 + (337/240)*n^2 + (10541/420)*n
Empirical for n mod 2 = 1: a(n) = (459901/26880)*n^7 + (238219/1920)*n^6 + (86757/256)*n^5 + (50735/128)*n^4 + (513337/3840)*n^3 - (25939/1920)*n^2 + (87707/5376)*n - (119/128)
EXAMPLE
Some solutions for n=2
..0....2....2....1....1....4....0....1....0....0....3....0....2....2....1....2
..4....2....3....3....2....3....0....4....4....1....0....3....4....4....4....0
..1....0....3....4....1....1....4....1....0....1....2....1....0....4....0....2
..0....0....0....2....4....2....0....4....1....0....0....1....0....2....3....2
..3....4....4....0....0....4....2....1....3....3....4....4....4....4....2....4
..3....3....3....3....2....1....0....2....1....0....3....1....2....0....3....0
..1....0....1....0....3....0....1....3....1....3....2....0....3....2....2....3
..0....4....4....1....1....4....0....3....0....0....3....2....4....0....1....4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 10 2014
STATUS
approved