|
| |
|
|
A203881
|
|
Number of (n+1)X3 0..6 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements
|
|
1
|
|
|
|
8281, 254359, 7501753, 222645367, 6601376089, 195759462871, 5804976472057, 172139217677623, 5104567195084441, 151369391916622999, 4488665070837227833, 133105602855424669687, 3947075851161154183129, 117045469473077458995031
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
Column 2 of A203887
|
|
|
LINKS
|
R. H. Hardin, Table of n, a(n) for n = 1..210
|
|
|
FORMULA
|
Empirical: a(n) = 25*a(n-1) +138*a(n-2)
|
|
|
EXAMPLE
|
Some solutions for n=4
..0..5..2....4..1..5....4..0..4....1..2..1....2..0..1....0..0..5....4..5..3
..5..0..5....5..4..1....1..4..3....1..1..5....2..2..0....5..0..0....3..4..5
..2..5..6....2..5..4....5..1..4....5..1..1....6..2..2....3..5..0....1..3..4
..3..2..5....5..1..5....6..5..1....3..5..1....3..6..2....1..3..5....1..1..3
..3..3..2....3..5..5....4..6..5....2..3..5....5..3..6....1..1..3....1..6..1
|
|
|
CROSSREFS
|
Sequence in context: A188101 A157731 A064014 * A145527 A054215 A031679
Adjacent sequences: A203878 A203879 A203880 * A203882 A203883 A203884
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
R. H. Hardin Jan 07 2012
|
|
|
STATUS
|
approved
|
| |
|
|
