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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 19 |
| 3 | 151 |
| 4 | 1439 |
| 5 | 16651 |
| 6 | 234651 |
| 7 | 3966271 |
| 8 | 78504063 |
| 9 | 1778555587 |
| 10 | 45302809003 |
| 11 | 1279960719335 |
| 12 | 39697452556959 |
| 13 | 1340332692660027 |
| 14 | 48929424425580219 |
| 15 | 1920103548827941263 |
| 16 | 80597817202971009535 |
| 17 | 3603262730476776975731 |
| 18 | 170923354522784683176267 |
[1,3,19,151,1439,16651,234651,3966271,78504063, 1778555587,45302809003,1279960719335, 39697452556959,1340332692660027,48929424425580219, 1920103548827941263,80597817202971009535, 3603262730476776975731,170923354522784683176267] |