OFFSET
1,2
COMMENTS
Column 5 of A212943
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 8001*a(n-1) -24144750*a(n-2) +35582371250*a(n-3) -27539217890625*a(n-4) +11055908759765625*a(n-5) -2081011816406250000*a(n-6) +133539505004882812500*a(n-7).
Empirical: a(n) = -2*350^n+3*875^n+3*1125^n+3125^n+126^n-4*1875^n-2*525^n. R. J. Mathar, Jun 27 2012
EXAMPLE
Some solutions for n=4
..3..0..3..3..1....3..4..4..3..2....0..4..4..3..0....3..2..4..0..0
..4..1..1..3..3....0..1..3..1..4....2..1..1..4..3....0..3..4..0..4
..3..3..1..2..0....1..0..2..0..1....1..2..0..3..2....3..1..3..0..1
..4..0..4..3..4....4..2..0..3..0....3..0..1..2..0....2..1..0..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin May 31 2012
STATUS
approved