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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 141 |
| 4 | 2776 |
| 5 | 70045 |
| 6 | 2157156 |
| 7 | 78452521 |
| 8 | 3290644288 |
| 9 | 156380715801 |
| 10 | 8304267312100 |
| 11 | 487328231729581 |
| 12 | 31318669850761008 |
| 13 | 2187567259278425557 |
| 14 | 165011952533314548676 |
| 15 | 13368463736048341225425 |
| 16 | 1157693100510102752463616 |
| 17 | 106719312722496774534400177 |
| 18 | 10433609651067618426072766020 |
[1,1,10,141,2776,70045,2157156,78452521, 3290644288,156380715801,8304267312100, 487328231729581,31318669850761008, 2187567259278425557,165011952533314548676, 13368463736048341225425,1157693100510102752463616, 106719312722496774534400177, 10433609651067618426072766020] |