OFFSET
1,1
COMMENTS
Column 7 of A223331
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 692*a(n-1) -43569*a(n-2) +847042*a(n-3) -6303164*a(n-4) +15731352*a(n-5)
EXAMPLE
Some solutions for n=3
..0..4..0..4..5..4..5....0..4..0..4..6..7..3....0..4..0..4..0..4..0
..0..4..0..1..5..1..3....0..4..0..2..3..1..5....0..4..0..4..6..2..0
..0..4..5..4..5..1..5....0..4..6..7..5..7..6....0..4..6..2..6..2..0
Vertex neighbors:
0 -> 1 2 4
1 -> 0 3 5
2 -> 0 3 6
3 -> 1 2 7
4 -> 0 5 6
5 -> 1 4 7
6 -> 2 4 7
7 -> 3 5 6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 19 2013
STATUS
approved