|
| |
|
|
A147087
|
|
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10001-11111 pattern in any orientation.
|
|
0
| |
|
|
1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 9, 15, 27, 43, 124, 355, 1029, 2971, 10017, 31249, 124044, 490643, 2352059, 10915093, 60936189, 323565841, 2097402227
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,9
|
|
|
EXAMPLE
| Maximal 9 X 9 example
.0.0.1.0.0.0.1.0.0
.0.0.1.1.1.1.1.0.0
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.0.0.1.1.1.1.1.0.0
.0.0.1.0.0.0.1.0.0
|
|
|
CROSSREFS
| Sequence in context: A034084 A018342 A029485 * A140190 A083658 A018436
Adjacent sequences: A147084 A147085 A147086 * A147088 A147089 A147090
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Nov 04 2008
|
| |
|
|
