OFFSET
1,1
COMMENTS
Column 4 of A227165
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/1689515283456000)*n^19 + (1/42682491371520)*n^18 + (47/118562476032000)*n^17 + (289/10461394944000)*n^16 + (479/5230697472000)*n^15 + (7897/2092278988800)*n^14 + (1632263/10461394944000)*n^13 - (908693/603542016000)*n^12 + (896531/18289152000)*n^11 - (23306879/29262643200)*n^10 + (26023484833/1609445376000)*n^9 - (186161720861/804722688000)*n^8 + (2050542947543/871782912000)*n^7 - (5863470751207/392302310400)*n^6 + (78462384223117/1307674368000)*n^5 - (49466529613783/217945728000)*n^4 + (52739410297759/30875644800)*n^3 - (18770426920009/1715313600)*n^2 + (74837531735/2116296)*n - 43518 for n>8
EXAMPLE
Some solutions for n=4
..1..0..0..0....1..1..1..1....1..1..0..0....1..1..1..1....1..1..1..0
..0..0..0..1....1..1..1..0....1..1..0..0....1..0..0..0....1..1..0..1
..0..0..1..1....0..0..0..0....0..0..1..0....0..0..0..0....1..0..0..1
..0..0..0..1....0..0..0..1....0..0..0..0....0..1..1..1....0..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 03 2013
STATUS
approved