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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 243 |
| 5 | 5041 |
| 6 | 122793 |
| 7 | 3433557 |
| 8 | 108824679 |
| 9 | 3857180303 |
| 10 | 151189425233 |
| 11 | 6495604450659 |
| 12 | 303671019221745 |
| 13 | 15353507145898735 |
| 14 | 835092643075565163 |
| 15 | 48637547540923032151 |
| 16 | 3020890094905581400107 |
| 17 | 199356631125403317760803 |
| 18 | 13932407051414083995444277 |
| 19 | 1028080194901048673942405547 |
| 20 | 79883891921410823861579965753 |
[1,1,3,17,243,5041,122793,3433557,108824679, 3857180303,151189425233,6495604450659, 303671019221745,15353507145898735, 835092643075565163,48637547540923032151, 3020890094905581400107,199356631125403317760803, 13932407051414083995444277, 1028080194901048673942405547, 79883891921410823861579965753] |