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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 8 |
| 3 | 36 |
| 4 | 181 |
| 5 | 1000 |
| 6 | 5985 |
| 7 | 38416 |
| 8 | 262144 |
| 9 | 1889568 |
| 10 | 14310835 |
| 11 | 113379904 |
| 12 | 936209559 |
| 13 | 8031810176 |
| 14 | 71397866601 |
| 15 | 656100000000 |
| 16 | 6219777023950 |
| 17 | 60716992766464 |
| 18 | 609359740010496 |
| 19 | 6278211847988224 |
| 20 | 66317769195774370 |
| 21 | 717368321110468608 |
| 22 | 7937902853812916501 |
| 23 | 89762301673555234816 |
| 24 | 1036371513660502339855 |
[0,2,8,36,181,1000,5985,38416,262144,1889568, 14310835,113379904,936209559,8031810176, 71397866601,656100000000,6219777023950, 60716992766464,609359740010496,6278211847988224, 66317769195774370,717368321110468608, 7937902853812916501,89762301673555234816, 1036371513660502339855] |