OFFSET
1,1
COMMENTS
Column 7 of A223282
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 193*a(n-1) -13138*a(n-2) +389164*a(n-3) -4361048*a(n-4) -16478976*a(n-5) +680367552*a(n-6) -2205737728*a(n-7) -32395676672*a(n-8) +159364997888*a(n-9) +669407522304*a(n-10) -3582601411584*a(n-11) -5951537518592*a(n-12) +34040410587136*a(n-13) +16838602686464*a(n-14) -137580342149120*a(n-15) +18193951227904*a(n-16) +210744868077568*a(n-17) -92999396622336*a(n-18) -80015240724480*a(n-19) +37572373905408*a(n-20)
EXAMPLE
Some solutions for n=3
..0..1..0..2..3..4..3....0..1..0..2..8..2..0....0..1..4..3.16..3.16
..0..1..0..2..3..4.17....0..5..0..2..0..2..3....0..1..4..3..2..3..2
..0..1..0..2..3..4..1....0..5..0..2..8..2..8....0..1..4..3..2..8..2
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