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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 74 |
| 4 | 642 |
| 5 | 6082 |
| 6 | 60970 |
| 7 | 635818 |
| 8 | 6826690 |
| 9 | 74958914 |
| 10 | 837833482 |
| 11 | 9500939978 |
| 12 | 109037364930 |
| 13 | 1264049402754 |
| 14 | 14780619799722 |
| 15 | 174121322204074 |
| 16 | 2064572904600706 |
| 17 | 24620095821589378 |
| 18 | 295087003429677322 |
| 19 | 3552841638851183690 |
| 20 | 42950428996378731010 |
[1,2,10,74,642,6082,60970,635818,6826690,74958914, 837833482,9500939978,109037364930,1264049402754, 14780619799722,174121322204074,2064572904600706, 24620095821589378,295087003429677322, 3552841638851183690,42950428996378731010] |