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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 117 |
| 4 | 1648 |
| 5 | 27425 |
| 6 | 528336 |
| 7 | 11581885 |
| 8 | 284878336 |
| 9 | 7772592897 |
| 10 | 233010784000 |
| 11 | 7614411069221 |
| 12 | 269412832512000 |
| 13 | 10261487793254113 |
| 14 | 418636033893726208 |
| 15 | 18213563455467238125 |
| 16 | 841799936112774086656 |
| 17 | 41189866031118283907585 |
| 18 | 2127207204243268173103104 |
[1,10,117,1648,27425,528336,11581885,284878336, 7772592897,233010784000,7614411069221, 269412832512000,10261487793254113, 418636033893726208,18213563455467238125, 841799936112774086656,41189866031118283907585, 2127207204243268173103104] |