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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 89 |
| 4 | 1144 |
| 5 | 19237 |
| 6 | 402292 |
| 7 | 10076467 |
| 8 | 294435680 |
| 9 | 9842422985 |
| 10 | 370678591684 |
| 11 | 15537544991575 |
| 12 | 717711797249344 |
| 13 | 36234873537957421 |
| 14 | 1985661659081360852 |
| 15 | 117415812545786700803 |
| 16 | 7454037992785099114816 |
| 17 | 505819653769275584567185 |
| 18 | 36549387566762559927313924 |
| 19 | 2802817106895324406986830863 |
| 20 | 227441704405405503356461103456 |
[1,2,10,89,1144,19237,402292,10076467,294435680, 9842422985,370678591684,15537544991575, 717711797249344,36234873537957421, 1985661659081360852,117415812545786700803, 7454037992785099114816,505819653769275584567185, 36549387566762559927313924, 2802817106895324406986830863, 227441704405405503356461103456] |