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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 60 |
| 5 | 406 |
| 6 | 2940 |
| 7 | 22304 |
| 8 | 174960 |
| 9 | 1407582 |
| 10 | 11550396 |
| 11 | 96299472 |
| 12 | 813433712 |
| 13 | 6946442776 |
| 14 | 59872428672 |
| 15 | 520174647424 |
| 16 | 4550665293920 |
| 17 | 40052871669422 |
| 18 | 354421196057404 |
| 19 | 3151211548631856 |
| 20 | 28137903707808048 |
| 21 | 252219507331523688 |
| 22 | 2268719274696321856 |
| 23 | 20472066335198022080 |
| 24 | 185268984285773695200 |
[1,2,10,60,406,2940,22304,174960,1407582,11550396, 96299472,813433712,6946442776,59872428672, 520174647424,4550665293920,40052871669422, 354421196057404,3151211548631856, 28137903707808048,252219507331523688, 2268719274696321856,20472066335198022080, 185268984285773695200] |