OFFSET
1,1
COMMENTS
Column 5 of A223282.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 45*a(n-1) - 518*a(n-2) + 1268*a(n-3) + 1704*a(n-4) - 4064*a(n-5) + 1536*a(n-6).
Empirical g.f.: 3*x*(9 - 68*x + 64*x^2)*(3 - 54*x - 76*x^2 + 56*x^3) / (1 - 45*x + 518*x^2 - 1268*x^3 - 1704*x^4 + 4064*x^5 - 1536*x^6). - Colin Barker, Aug 18 2018
EXAMPLE
Some solutions for n=3:
0 1 0 1 4 0 1 0 5 9 0 5 0 2 0 0 1 4 1 6
6 1 0 1 0 0 5 0 5 7 0 5 0 2 8 4 1 4 1 4
0 1 0 1 6 9 5 0 5 9 9 5 0 2 3 6 1 6 1 6
Face neighbors:
0 -> 1 2 5
1 -> 0 4 6
2 -> 0 3 8
3 -> 2 4 16
4 -> 3 1 17
5 -> 0 7 9
6 -> 1 7 10
7 -> 6 5 11
8 -> 2 9 13
9 -> 8 5 14
10 -> 6 12 17
11 -> 7 12 14
12 -> 11 10 19
13 -> 8 15 16
14 -> 9 11 15
15 -> 14 13 19
16 -> 3 13 18
17 -> 4 10 18
18 -> 16 17 19
19 -> 15 18 12
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 19 2013
STATUS
approved