A008278 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 1 | | 3 | | 1 |
| | | | | | | | 1 | | 6 | | 7 | | 1 |
| | | | | | | 1 | | 10 | | 25 | | 15 | | 1 |
| | | | | | 1 | | 15 | | 65 | | 90 | | 31 | | 1 |
| | | | | 1 | | 21 | | 140 | | 350 | | 301 | | 63 | | 1 |
| | | | 1 | | 28 | | 266 | | 1050 | | 1701 | | 966 | | 127 | | 1 |
| | | 1 | | 36 | | 462 | | 2646 | | 6951 | | 7770 | | 3025 | | 255 | | 1 |
| | 1 | | 45 | | 750 | | 5880 | | 22827 | | 42525 | | 34105 | | 9330 | | 511 | | 1 |
|
A008278 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45
| | 1 | 7 | 25 | 65 | 140 | 266 | 462 | 750
| | 1 | 15 | 90 | 350 | 1050 | 2646 | 5880
| | 1 | 31 | 301 | 1701 | 6951 | 22827
| | 1 | 63 | 966 | 7770 | 42525
| | 1 | 127 | 3025 | 34105
| | 1 | 255 | 9330
| | 1 | 511
| | 1
|
A008278 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45
| | | 1 | 7 | 25 | 65 | 140 | 266 | 462 | 750
| | | | 1 | 15 | 90 | 350 | 1050 | 2646 | 5880
| | | | | 1 | 31 | 301 | 1701 | 6951 | 22827
| | | | | | 1 | 63 | 966 | 7770 | 42525
| | | | | | | 1 | 127 | 3025 | 34105
| | | | | | | | 1 | 255 | 9330
| | | | | | | | | 1 | 511
| | | | | | | | | | 1
|
|
