OFFSET
1,1
COMMENTS
Row 6 of A228740
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (n+1)*(11*n^5+199*n^4+706*n^3+824*n^2+420*n+90)/90.
Empirical: G.f. -x*(50+97*x-7*x^2-70*x^3+24*x^4-7*x^5+x^6) / (x-1)^7 . - R. J. Mathar, Sep 02 2013
EXAMPLE
Some solutions for n=4
..2..3..1..2..4..3..4..4..0..4..2..1..0..3..4..2
..1..4..3..2..2..2..0..3..3..2..4..2..2..3..0..0
..2..1..0..4..2..1..0..4..3..2..0..3..1..3..0..3
..1..1..4..4..1..0..2..2..3..2..4..3..3..3..3..0
..4..1..0..4..4..1..2..3..1..3..0..0..1..0..3..2
..3..4..0..2..2..3..4..2..0..2..0..0..0..1..4..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 01 2013
STATUS
approved