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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 46 |
| 4 | 485 |
| 5 | 7066 |
| 6 | 130987 |
| 7 | 2946182 |
| 8 | 77923561 |
| 9 | 2369742130 |
| 10 | 81467904431 |
| 11 | 3124302688222 |
| 12 | 132237820201357 |
| 13 | 6123150708289226 |
| 14 | 307903794151741075 |
| 15 | 16709463201832993846 |
| 16 | 973385368533058021457 |
| 17 | 60583668821975488285282 |
| 18 | 4012342371757905842648791 |
| 19 | 281735471040327667890013070 |
[1,2,7,46,485,7066,130987,2946182,77923561, 2369742130,81467904431,3124302688222, 132237820201357,6123150708289226, 307903794151741075,16709463201832993846, 973385368533058021457,60583668821975488285282, 4012342371757905842648791, 281735471040327667890013070] |