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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 70 |
| 6 | 134 |
| 7 | 146 |
| 8 | 190 |
| 9 | 218 |
| 10 | 292 |
| 11 | 478 |
| 12 | 7136 |
| 13 | 15964 |
| 14 | 19988 |
| 15 | 100790 |
| 16 | 111442 |
| 17 | 181874 |
| 18 | 202112 |
[1,2,4,10,70,134,146,190,218,292,478,7136,15964, 19988,100790,111442,181874,202112] |