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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 26 |
| 3 | 274 |
| 4 | 4721 |
| 5 | 134899 |
| 6 | 6501536 |
| 7 | 537766009 |
| 8 | 77598500096 |
| 9 | 19821981700354 |
| 10 | 9077118324755246 |
| 11 | 7531446638893873684 |
| 12 | 11423775838657143826346 |
| 13 | 31914367054676982206368909 |
| 14 | 165251261153335414813452988541 |
[1,4,26,274,4721,134899,6501536,537766009, 77598500096,19821981700354,9077118324755246, 7531446638893873684,11423775838657143826346, 31914367054676982206368909, 165251261153335414813452988541] |