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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 14 |
| 2 | 100 |
| 3 | 728 |
| 4 | 5392 |
| 5 | 40544 |
| 6 | 308800 |
| 7 | 2377088 |
| 8 | 18456832 |
| 9 | 144295424 |
| 10 | 1134208000 |
| 11 | 8952731648 |
| 12 | 70896259072 |
| 13 | 562816507904 |
| 14 | 4476410675200 |
| 15 | 35654557073408 |
| 16 | 284296086618112 |
| 17 | 2268726473129984 |
| 18 | 18115958466150400 |
| 19 | 144724547815866368 |
[2,14,100,728,5392,40544,308800,2377088,18456832, 144295424,1134208000,8952731648,70896259072, 562816507904,4476410675200,35654557073408, 284296086618112,2268726473129984, 18115958466150400,144724547815866368] |