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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 9 |
| 3 | 36 |
| 4 | 146 |
| 5 | 585 |
| 6 | 2340 |
| 7 | 9362 |
| 8 | 37449 |
| 9 | 149796 |
| 10 | 599186 |
| 11 | 2396745 |
| 12 | 9586980 |
| 13 | 38347922 |
| 14 | 153391689 |
| 15 | 613566756 |
| 16 | 2454267026 |
| 17 | 9817068105 |
| 18 | 39268272420 |
| 19 | 157073089682 |
| 20 | 628292358729 |
| 21 | 2513169434916 |
| 22 | 10052677739666 |
| 23 | 40210710958665 |
[2,9,36,146,585,2340,9362,37449,149796,599186, 2396745,9586980,38347922,153391689,613566756, 2454267026,9817068105,39268272420,157073089682, 628292358729,2513169434916,10052677739666, 40210710958665] |