|
| |
|
|
A199142
|
|
Number of nX1 0..3 arrays with values 0..3 introduced in row major order and each element equal to one or two horizontal and vertical neighbors
|
|
1
|
|
|
|
0, 1, 1, 2, 3, 6, 11, 23, 47, 102, 221, 492, 1099, 2485, 5637, 12858, 29391, 67354, 154539, 355003, 816035, 1876862, 4318201, 9937840, 22874731, 52659593, 121237417, 279141170, 642732027, 1479959118, 3407837387, 7847200511
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,4
|
|
|
COMMENTS
|
Column 1 of A199149
|
|
|
LINKS
|
R. H. Hardin, Table of n, a(n) for n = 1..200
|
|
|
FORMULA
|
Empirical: a(n) = 3*a(n-1) +a(n-2) -7*a(n-3) +a(n-4) +3*a(n-5) for n>6
|
|
|
EXAMPLE
|
Some solutions for n=8
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....0....0....1....1....1....0....1....1....0....1....0....0....0....1....0
..1....1....0....1....1....1....1....1....1....0....1....0....0....0....1....0
..2....1....1....1....1....0....1....2....1....0....2....1....0....1....1....0
..2....1....1....0....2....0....0....2....1....1....2....1....0....1....1....0
..2....0....0....0....2....1....0....1....0....1....3....1....0....2....2....1
..2....0....0....0....2....1....0....1....0....1....3....1....0....2....2....1
|
|
|
CROSSREFS
|
Sequence in context: A036592 A001190 A036656 * A090344 A198662 A198620
Adjacent sequences: A199139 A199140 A199141 * A199143 A199144 A199145
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
R. H. Hardin Nov 03 2011
|
|
|
STATUS
|
approved
|
| |
|
|
