A278807 as a triangular array
| | | | | | | | | | 3 |
| | | | | | | | | | 6 | | 6 |
| | | | | | | | | 10 | | 22 | | 10 |
| | | | | | | | 15 | | 63 | | 63 | | 15 |
| | | | | | | 21 | | 154 | | 322 | | 154 | | 21 |
| | | | | | 28 | | 336 | | 1439 | | 1439 | | 336 | | 28 |
| | | | | 36 | | 672 | | 5767 | | 12958 | | 5767 | | 672 | | 36 |
| | | | 45 | | 1254 | | 20972 | | 110455 | | 110455 | | 20972 | | 1254 | | 45 |
| | | 55 | | 2211 | | 69834 | | 870473 | | 2179956 | | 870473 | | 69834 | | 2211 | | 55 |
| | 66 | | 3718 | | 214774 | | 6275546 |
|
A278807 as a square array
3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55 | 66
| 6 | 22 | 63 | 154 | 336 | 672 | 1254 | 2211 | 3718
| 10 | 63 | 322 | 1439 | 5767 | 20972 | 69834 | 214774
| 15 | 154 | 1439 | 12958 | 110455 | 870473 | 6275546
| 21 | 336 | 5767 | 110455 | 2179956
| 28 | 672 | 20972 | 870473
| 36 | 1254 | 69834
| 45 | 2211
| 55
|
A278807 as an upper right triangle
3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55 | 66
| | 6 | 22 | 63 | 154 | 336 | 672 | 1254 | 2211 | 3718
| | | 10 | 63 | 322 | 1439 | 5767 | 20972 | 69834 | 214774
| | | | 15 | 154 | 1439 | 12958 | 110455 | 870473 | 6275546
| | | | | 21 | 336 | 5767 | 110455 | 2179956
| | | | | | 28 | 672 | 20972 | 870473
| | | | | | | 36 | 1254 | 69834
| | | | | | | | 45 | 2211
| | | | | | | | | 55
| | | | | | | | |
|
|