A109955 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | 1 | | 4 | | 1 |
| | | | | | | | | 1 | | 10 | | 7 | | 1 |
| | | | | | | | 1 | | 20 | | 28 | | 10 | | 1 |
| | | | | | | 1 | | 35 | | 84 | | 55 | | 13 | | 1 |
| | | | | | 1 | | 56 | | 210 | | 220 | | 91 | | 16 | | 1 |
| | | | | 1 | | 84 | | 462 | | 715 | | 455 | | 136 | | 19 | | 1 |
| | | | 1 | | 120 | | 924 | | 2002 | | 1820 | | 816 | | 190 | | 22 | | 1 |
| | | 1 | | 165 | | 1716 | | 5005 | | 6188 | | 3876 | | 1330 | | 253 | | 25 | | 1 |
| | 1 | | 220 | | 3003 | | 11440 | | 18564 | | 15504 | | 7315 | | 2024 |
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A109955 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 10 | 20 | 35 | 56 | 84 | 120 | 165 | 220
| | 1 | 7 | 28 | 84 | 210 | 462 | 924 | 1716 | 3003
| | 1 | 10 | 55 | 220 | 715 | 2002 | 5005 | 11440
| | 1 | 13 | 91 | 455 | 1820 | 6188 | 18564
| | 1 | 16 | 136 | 816 | 3876 | 15504
| | 1 | 19 | 190 | 1330 | 7315
| | 1 | 22 | 253 | 2024
| | 1 | 25
| | 1
|
A109955 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 10 | 20 | 35 | 56 | 84 | 120 | 165 | 220
| | | 1 | 7 | 28 | 84 | 210 | 462 | 924 | 1716 | 3003
| | | | 1 | 10 | 55 | 220 | 715 | 2002 | 5005 | 11440
| | | | | 1 | 13 | 91 | 455 | 1820 | 6188 | 18564
| | | | | | 1 | 16 | 136 | 816 | 3876 | 15504
| | | | | | | 1 | 19 | 190 | 1330 | 7315
| | | | | | | | 1 | 22 | 253 | 2024
| | | | | | | | | 1 | 25
| | | | | | | | | | 1
| | | | | | | | | |
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