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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 18 |
| 3 | 595 |
| 4 | 20196 |
| 5 | 686053 |
| 6 | 23305590 |
| 7 | 791703991 |
| 8 | 26894630088 |
| 9 | 913625718985 |
| 10 | 31036379815386 |
| 11 | 1054323288004123 |
| 12 | 35815955412324780 |
| 13 | 1216688160731038381 |
| 14 | 41331581509442980158 |
| 15 | 1404057083160330286975 |
| 16 | 47696609245941786776976 |
| 17 | 1620280657278860420130193 |
[1,18,595,20196,686053,23305590,791703991, 26894630088,913625718985,31036379815386, 1054323288004123,35815955412324780, 1216688160731038381,41331581509442980158, 1404057083160330286975,47696609245941786776976, 1620280657278860420130193] |