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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 206 |
| 4 | 9075 |
| 5 | 263816 |
| 6 | 14958462 |
| 7 | 502139307 |
| 8 | 31597696508 |
| 9 | 1127672103190 |
| 10 | 73924985889908 |
| 11 | 2699420212510000 |
| 12 | 179603126881546244 |
| 13 | 6611550302229079818 |
| 14 | 442182385217685453306 |
| 15 | 16323504870646998312596 |
| 16 | 1093691375020731513203835 |
[1,13,206,9075,263816,14958462,502139307, 31597696508,1127672103190,73924985889908, 2699420212510000,179603126881546244, 6611550302229079818,442182385217685453306, 16323504870646998312596,1093691375020731513203835] |