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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 130 |
| 4 | 5801 |
| 5 | 549066 |
| 6 | 86723617 |
| 7 | 20271902834 |
| 8 | 6531967419105 |
| 9 | 2765255048181586 |
| 10 | 1485110148765267161 |
| 11 | 985070868793251223842 |
| 12 | 790007920377720295086409 |
| 13 | 752911901689684021069284410 |
[1,2,9,130,5801,549066,86723617,20271902834, 6531967419105,2765255048181586, 1485110148765267161,985070868793251223842, 790007920377720295086409, 752911901689684021069284410] |