A028246 formatted as a triangular array:
| | | | | | | | 1 | | | | | | | | |
| | | | | | | 1 | | 1 | | | | | | | |
| | | | | | 1 | | 3 | | 2 | | | | | | |
| | | | | 1 | | 7 | | 12 | | 6 | | | | | |
| | | | 1 | | 15 | | 50 | | 60 | | 24 | | | | |
| | | 1 | | 31 | | 180 | | 390 | | 360 | | 120 | | | |
| | 1 | | 63 | | 602 | | 2100 | | 3360 | | 2520 | | 720 | | |
| 1 | | 127 | | 1932 | | 10206 | | 25200 | | 31920 | | 20160 | | 5040 | |
| 1 | | 255 | | 6050 | | 46620 | | 166824 | | 317520 | | 332640 | | 181440 | | 40320 |
A028246 formatted as a square array:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 3 | 7 | 15 | 31 | 63 | 127 | 255 | |
| 2 | 12 | 50 | 180 | 602 | 1932 | 6050 | | |
| 6 | 60 | 390 | 2100 | 10206 | 46620 | | | |
| 24 | 360 | 3360 | 25200 | 166824 | | | | |
| 120 | 2520 | 31920 | 317520 | | | | | |
| 720 | 20160 | 332640 | | | | | | |
| 5040 | 181440 | | | | | | | |
| 40320 | | | | | | | | |
A028246 formatted as an upper right triangle:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 3 | 7 | 15 | 31 | 63 | 127 | 255 |
| | 2 | 12 | 50 | 180 | 602 | 1932 | 6050 |
| | | 6 | 60 | 390 | 2100 | 10206 | 46620 |
| | | | 24 | 360 | 3360 | 25200 | 166824 |
| | | | | 120 | 2520 | 31920 | 317520 |
| | | | | | 720 | 20160 | 332640 |
| | | | | | | 5040 | 181440 |
| | | | | | | | 40320 |
|
