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| n | a(n) |
|---|---|
| 1 | 462 |
| 2 | 1766 |
| 3 | 7432 |
| 4 | 31560 |
| 5 | 134338 |
| 6 | 572940 |
| 7 | 2443538 |
| 8 | 10435120 |
| 9 | 44531700 |
| 10 | 190115264 |
| 11 | 811684628 |
| 12 | 3465080340 |
| 13 | 14793419426 |
| 14 | 63158067342 |
| 15 | 269636162320 |
| 16 | 1151155105390 |
| 17 | 4914626712708 |
| 18 | 20981886699758 |
| 19 | 89577729008448 |
| 20 | 382433328039802 |
[462,1766,7432,31560,134338,572940,2443538, 10435120,44531700,190115264,811684628,3465080340, 14793419426,63158067342,269636162320, 1151155105390,4914626712708,20981886699758, 89577729008448,382433328039802] |