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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 129 |
| 3 | 942 |
| 4 | 3186 |
| 5 | 13278 |
| 6 | 34314 |
| 7 | 136086 |
| 8 | 399018 |
| 9 | 1537038 |
| 10 | 4607034 |
| 11 | 16888062 |
| 12 | 51777498 |
| 13 | 185254926 |
| 14 | 580089834 |
| 15 | 2037893214 |
| 16 | 6478793466 |
| 17 | 22450788942 |
| 18 | 72203998026 |
| 19 | 247694103486 |
| 20 | 803564559834 |
| 21 | 2735884703406 |
| 22 | 8933648141802 |
[81,129,942,3186,13278,34314,136086,399018, 1537038,4607034,16888062,51777498,185254926, 580089834,2037893214,6478793466,22450788942, 72203998026,247694103486,803564559834, 2735884703406,8933648141802] |