OFFSET
1,1
COMMENTS
Column 4 of A264244.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 19*a(n-1) -42*a(n-2) -600*a(n-3) +2768*a(n-4) +2064*a(n-5) -29636*a(n-6) +37104*a(n-7) +54432*a(n-8) -121808*a(n-9) +3440*a(n-10) +66048*a(n-11) +320*a(n-12) +115712*a(n-13) -190720*a(n-14) -115456*a(n-15) +246016*a(n-16) +15360*a(n-17) -81920*a(n-18)
EXAMPLE
Some solutions for n=4
..0..1..4..3..8....0..1..4..7..8....0..1..4..3..8....0..2..6..3..4
..5..6..7..2..9....5..6..9..2..3....5.10..7..2..9....5.10..1.12..9
.11.13.16.17.14...12.13.16.14.18...12.11..6.13.14...11.15.14..7..8
.15.10.21.12.19...15.10.11.22.19...16.17.21.18.19...17.20.18.19.13
.20.23.22.24.18...20.21.23.17.24...20.15.22.23.24...22.21.16.23.24
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 09 2015
STATUS
approved