OFFSET
1,2
COMMENTS
Column 5 of A209543
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 19*a(n-1) +16*a(n-2) -119472*a(n-5) +2269968*a(n-6) +1911552*a(n-7) +606867456*a(n-10) -11530481664*a(n-11) -9709879296*a(n-12) +125275471872*a(n-15) -2380233965568*a(n-16) -2004407549952*a(n-17) -1099511627776*a(n-20) +20890720927744*a(n-21) +17592186044416*a(n-22) for n>24
EXAMPLE
Some solutions for n=4
..7.10..2..3.13....0..8..2..3.13....0.10..2..3.13....0.10.11.12..4
..5.15..0.17..9....5.15.14.17..9....5..6.14.17.18....5..6.14.17..9
..1.18.19..4.14....1.11.19..4..7....1.11.12..4..7....1..2..3.13..7
..6.16..8.11.12....6.16.10.18.12...15.16..8..9.19...15.16..8.18.19
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 2012
STATUS
approved