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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 15 |
| 4 | 164 |
| 5 | 2190 |
| 6 | 33384 |
| 7 | 561659 |
| 8 | 10226376 |
| 9 | 198975366 |
| 10 | 4101249990 |
| 11 | 88985266436 |
| 12 | 2022670569000 |
| 13 | 47986654728506 |
| 14 | 1184722493746988 |
| 15 | 30364559922967455 |
| 16 | 806313807163378768 |
| 17 | 22146014022165507644 |
| 18 | 628220131284285896472 |
| 19 | 18382404744008384580629 |
| 20 | 554214116675011187495440 |
[1,2,15,164,2190,33384,561659,10226376,198975366, 4101249990,88985266436,2022670569000, 47986654728506,1184722493746988,30364559922967455, 806313807163378768,22146014022165507644, 628220131284285896472,18382404744008384580629, 554214116675011187495440] |