|
|
A156457
|
|
Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 12.
|
|
0
|
|
|
1, 4, 0, 18, 90, 5154, 19368, 2108280, 31103100, 3164432181, 105602337600, 14188463179758, 817218706478195
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
3,2
|
|
LINKS
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|