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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 75 |
| 3 | 959 |
| 4 | 13512 |
| 5 | 202433 |
| 6 | 3164018 |
| 7 | 51010415 |
| 8 | 842090988 |
| 9 | 14163385916 |
| 10 | 241843189651 |
| 11 | 4181341506009 |
| 12 | 73054000725300 |
| 13 | 1287786922627590 |
| 14 | 22876030462690500 |
| 15 | 409093644922627407 |
| 16 | 7358978253387945404 |
| 17 | 133067774551068558740 |
| 18 | 2417375777620571832476 |
[1,7,75,959,13512,202433,3164018,51010415, 842090988,14163385916,241843189651,4181341506009, 73054000725300,1287786922627590,22876030462690500, 409093644922627407,7358978253387945404, 133067774551068558740,2417375777620571832476] |