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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 9 |
| 3 | 40 |
| 4 | 155 |
| 5 | 617 |
| 6 | 2457 |
| 7 | 9785 |
| 8 | 38986 |
| 9 | 155300 |
| 10 | 618678 |
| 11 | 2464607 |
| 12 | 9818228 |
| 13 | 39112730 |
| 14 | 155812804 |
| 15 | 620709233 |
| 16 | 2472710322 |
| 17 | 9850500300 |
| 18 | 39241295090 |
| 19 | 156324978076 |
| 20 | 622749547526 |
| 21 | 2480838338958 |
| 22 | 9882879704522 |
| 23 | 39370284519705 |
| 24 | 156838831344437 |
[2,9,40,155,617,2457,9785,38986,155300,618678, 2464607,9818228,39112730,155812804,620709233, 2472710322,9850500300,39241295090,156324978076, 622749547526,2480838338958,9882879704522, 39370284519705,156838831344437] |