OFFSET
1,1
COMMENTS
Column 1 of A224658
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 10*a(n-1) -27*a(n-2) +252*a(n-3) -2340*a(n-4) +6318*a(n-5) -23427*a(n-6) +192150*a(n-7) -518805*a(n-8) +1061424*a(n-9) -7155540*a(n-10) +19319958*a(n-11) -25759944*a(n-12) +128799720*a(n-13) -347759244*a(n-14) +343901376*a(n-15) -1120618800*a(n-16) +3025670760*a(n-17) -2459272752*a(n-18) +4421589120*a(n-19) -11938290624*a(n-20) +8571080448*a(n-21) -6122200320*a(n-22) +16529940864*a(n-23) -11019960576*a(n-24)
EXAMPLE
Some solutions for n=2
..2..1..2....0..2..2....0..1..1....1..2..2....2..1..0....1..0..2....0..0..1
..0..2..2....1..1..1....1..1..0....2..2..0....1..2..0....2..0..2....1..0..1
..1..1..1....0..1..2....2..0..0....1..0..2....2..0..1....2..2..2....2..1..0
..2..2..1....0..2..2....0..1..1....2..2..1....2..1..0....2..1..0....0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 13 2013
STATUS
approved