|
| |
|
|
A140984
|
|
Half the number of n X n binary matrices, symmetric under 180 degree rotation, having equal row sums.
|
|
1
| |
|
|
1, 2, 4, 35, 226, 7592, 156752, 22458249, 1718157826, 941605438142, 250228936146872, 572800408273738658, 580834777459374862880, 5136409738603278958315040, 18792196647668946085817284928
(list; graph; refs; listen; history; internal format)
|
| |
| |
|
|
