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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 8 |
| 4 | 33 |
| 5 | 138 |
| 6 | 563 |
| 7 | 2268 |
| 8 | 9093 |
| 9 | 36398 |
| 10 | 145623 |
| 11 | 582528 |
| 12 | 2330153 |
| 13 | 9320658 |
| 14 | 37282683 |
| 15 | 149130788 |
| 16 | 596523213 |
| 17 | 2386092918 |
| 18 | 9544371743 |
| 19 | 38177487048 |
| 20 | 152709948273 |
| 21 | 610839793178 |
| 22 | 2443359172803 |
[2,3,8,33,138,563,2268,9093,36398,145623,582528, 2330153,9320658,37282683,149130788,596523213, 2386092918,9544371743,38177487048,152709948273, 610839793178,2443359172803] |