A181330 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | 3 | | 3 | | 1 |
| | | | | | | | | 8 | | 10 | | 5 | | 1 |
| | | | | | | | 21 | | 32 | | 21 | | 7 | | 1 |
| | | | | | | 55 | | 99 | | 80 | | 36 | | 9 | | 1 |
| | | | | | 144 | | 299 | | 286 | | 160 | | 55 | | 11 | | 1 |
| | | | | 377 | | 887 | | 978 | | 650 | | 280 | | 78 | | 13 | | 1 |
| | | | 987 | | 2595 | | 3236 | | 2482 | | 1275 | | 448 | | 105 | | 15 | | 1 |
| | | 2584 | | 7508 | | 10438 | | 9054 | | 5377 | | 2261 | | 672 | | 136 | | 17 | | 1 |
| | 6765 | | 21526 | | 32991 | | 31882 |
|
A181330 as a square array
1 | 1 | 3 | 8 | 21 | 55 | 144 | 377 | 987 | 2584 | 6765
| 1 | 3 | 10 | 32 | 99 | 299 | 887 | 2595 | 7508 | 21526
| 1 | 5 | 21 | 80 | 286 | 978 | 3236 | 10438 | 32991
| 1 | 7 | 36 | 160 | 650 | 2482 | 9054 | 31882
| 1 | 9 | 55 | 280 | 1275 | 5377
| 1 | 11 | 78 | 448 | 2261
| 1 | 13 | 105 | 672
| 1 | 15 | 136
| 1 | 17
| 1
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A181330 as an upper right triangle
1 | 1 | 3 | 8 | 21 | 55 | 144 | 377 | 987 | 2584 | 6765
| | 1 | 3 | 10 | 32 | 99 | 299 | 887 | 2595 | 7508 | 21526
| | | 1 | 5 | 21 | 80 | 286 | 978 | 3236 | 10438 | 32991
| | | | 1 | 7 | 36 | 160 | 650 | 2482 | 9054 | 31882
| | | | | 1 | 9 | 55 | 280 | 1275 | 5377
| | | | | | 1 | 11 | 78 | 448 | 2261
| | | | | | | 1 | 13 | 105 | 672
| | | | | | | | 1 | 15 | 136
| | | | | | | | | 1 | 17
| | | | | | | | | | 1
| | | | | | | | | |
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