OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 9*a(n-1) -2*a(n-2) -188*a(n-3) +413*a(n-4) +1077*a(n-5) -3828*a(n-6) -1678*a(n-7) +14385*a(n-8) -3643*a(n-9) -26998*a(n-10) +16004*a(n-11) +26132*a(n-12) -21362*a(n-13) -12072*a(n-14) +12608*a(n-15) +2016*a(n-16) -3096*a(n-17) +224*a(n-19).
EXAMPLE
Some solutions for n=5:
0 1 0 1 1 2 1 2 1 2 1 2 4 3 4 3 2 3 2 1
1 0 1 0 4 3 4 3 0 3 4 3 1 2 1 2 3 2 3 0
4 1 4 1 3 0 3 4 1 2 1 2 4 3 4 3 4 1 4 3
1 0 1 0 4 3 4 3 2 1 2 1 3 4 3 4 1 0 1 2
0 1 0 1 1 2 1 2 3 0 3 0 1 0 1 0 0 1 4 3
1 4 1 4 2 1 2 1 2 1 2 1 0 1 4 1 3 2 3 4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 01 2014
STATUS
approved