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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 10 |
| 3 | 56 |
| 4 | 435 |
| 5 | 4790 |
| 6 | 50535 |
| 7 | 547563 |
| 8 | 5815939 |
| 9 | 63130202 |
| 10 | 676152734 |
| 11 | 7328771224 |
| 12 | 79083695286 |
| 13 | 857913193954 |
| 14 | 9302185273377 |
| 15 | 101073333908828 |
| 16 | 1099637763169027 |
| 17 | 11970412457540599 |
| 18 | 130557727722965457 |
| 19 | 1423911243991041430 |
[4,10,56,435,4790,50535,547563,5815939,63130202, 676152734,7328771224,79083695286,857913193954, 9302185273377,101073333908828,1099637763169027, 11970412457540599,130557727722965457, 1423911243991041430] |