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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 38 |
| 4 | 947 |
| 5 | 37394 |
| 6 | 2120190 |
| 7 | 162980012 |
| 8 | 16330173251 |
| 9 | 2070201641498 |
| 10 | 324240251016266 |
| 11 | 61525045423103316 |
| 12 | 13913915097436287598 |
| 13 | 3698477457114061621492 |
| 14 | 1141824214469896983332508 |
[1,1,3,38,947,37394,2120190,162980012,16330173251, 2070201641498,324240251016266,61525045423103316, 13913915097436287598,3698477457114061621492, 1141824214469896983332508] |