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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 55 |
| 3 | 1330 |
| 4 | 58905 |
| 5 | 4187106 |
| 6 | 437353560 |
| 7 | 63140314380 |
| 8 | 12049276177620 |
| 9 | 2938311614386005 |
| 10 | 891655291709643461 |
| 11 | 329600203128234828790 |
| 12 | 145830232567505064233200 |
| 13 | 76102715775896720790887700 |
[1,5,55,1330,58905,4187106,437353560,63140314380, 12049276177620,2938311614386005, 891655291709643461,329600203128234828790, 145830232567505064233200, 76102715775896720790887700] |