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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 22 |
| 3 | 132 |
| 4 | 476 |
| 5 | 5869 |
| 6 | 89125 |
| 7 | 902141 |
| 8 | 12982595 |
| 9 | 174024827 |
| 10 | 2513147146 |
| 11 | 35812535764 |
| 12 | 514825664193 |
| 13 | 7444094395717 |
| 14 | 107716750932920 |
| 15 | 1560267702776647 |
| 16 | 22616336874366328 |
| 17 | 327901784821420818 |
| 18 | 4755230232057409078 |
[1,22,132,476,5869,89125,902141,12982595, 174024827,2513147146,35812535764,514825664193, 7444094395717,107716750932920,1560267702776647, 22616336874366328,327901784821420818, 4755230232057409078] |