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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 181 |
| 5 | 2321 |
| 6 | 37501 |
| 7 | 731935 |
| 8 | 16758393 |
| 9 | 440525377 |
| 10 | 13077834841 |
| 11 | 432796650551 |
| 12 | 15799794395749 |
| 13 | 630773263606513 |
| 14 | 27339525297079269 |
| 15 | 1278550150117141231 |
| 16 | 64171287394646697841 |
| 17 | 3440711053857464325377 |
[1,1,3,19,181,2321,37501,731935,16758393, 440525377,13077834841,432796650551,15799794395749, 630773263606513,27339525297079269, 1278550150117141231,64171287394646697841, 3440711053857464325377] |