OFFSET
1,1
COMMENTS
Column 5 of A223263
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 370*a(n-1) -36788*a(n-2) +1437857*a(n-3) -23645436*a(n-4) +44066638*a(n-5) +4152418604*a(n-6) -63940525346*a(n-7) +398765153937*a(n-8) -664612370820*a(n-9) -5099885524914*a(n-10) +28863389079161*a(n-11) -33790027717185*a(n-12) -116946512376714*a(n-13) +358006866555853*a(n-14) -172436681167814*a(n-15) -370765534337711*a(n-16) +342597755828578*a(n-17) +68864786255753*a(n-18) -118288709865366*a(n-19) +21489625020240*a(n-20)
EXAMPLE
Some solutions for n=3
..0..7..0..2..0....0..1..8..2..0....0..6..0..1..7....0..6..4..9.10
..6..0..5..0..7....6..0..2..1..2....6..0..5..7..5....6..0..2..8..4
..0..6..0..5.11....0..6..4..8..1....0..6.10..5.10....0..6..4..9.10
Vertex neighbors:
0.->.1.2.5.6.7
1.->.0.2.3.7.8
2.->.0.1.4.6.8
3.->.1.7.8.9.11
4.->.2.6.8.9.10
5.->.0.6.7.10.11
6.->.0.2.4.5.10
7.->.0.1.3.5.11
8.->.1.2.3.4.9
9.->.3.4.8.10.11
10.->.4.5.6.9.11
11.->.3.5.7.9.10
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 19 2013
STATUS
approved