|
|
A223328
|
|
Rolling cube footprints: number of n X 5 0..7 arrays starting with 0 where 0..7 label vertices of a cube and every array movement to a horizontal or antidiagonal neighbor moves along a corresponding cube edge.
|
|
1
|
|
|
81, 9261, 1059723, 121264857, 13876429707, 1587890407761, 181703507374179, 20792470582897209, 2379298227030964827, 272264906211251105313, 31155480347969275662483, 3565145318286297427548489
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 117*a(n-1) - 294*a(n-2).
Empirical g.f.: 27*x*(3 - 8*x) / (1 - 117*x + 294*x^2). - Colin Barker, Aug 19 2018
|
|
EXAMPLE
|
Some solutions for n=3:
..0..2..0..2..6....0..4..6..4..0....0..4..5..7..6....0..4..0..2..3
..0..2..0..2..6....6..2..0..4..0....0..4..6..4..6....6..2..6..2..0
..0..2..6..4..0....0..2..0..1..3....0..2..0..2..0....0..2..3..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
|
|
|
STATUS
|
approved
|
|
|
|