OFFSET
1,1
COMMENTS
Column 3 of A227103
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/1307674368000)*n^15 + (1/10897286400)*n^14 + (73/18681062400)*n^13 + (47/479001600)*n^12 + (713/326592000)*n^11 + (407/14515200)*n^10 + (170281/914457600)*n^9 + (790477/304819200)*n^8 + (1304149/186624000)*n^7 + (894611/43545600)*n^6 + (392782843/718502400)*n^5 + (120032611/39916800)*n^4 - (26912769857/756756000)*n^3 + (7313782601/50450400)*n^2 - (8615569/32760)*n + 352 for n>5
EXAMPLE
Some solutions for n=4
..0..1..0....0..0..0....0..1..1....1..0..0....0..1..0....0..0..0....0..0..0
..1..0..0....1..1..1....1..0..0....1..0..0....1..0..0....0..0..1....0..1..1
..0..0..1....0..0..0....0..1..1....1..1..1....1..0..0....1..1..1....1..1..0
..0..0..1....0..1..0....0..1..0....0..1..1....0..1..0....0..1..1....1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 01 2013
STATUS
approved