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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 9 |
| 3 | 38 |
| 4 | 154 |
| 5 | 617 |
| 6 | 2470 |
| 7 | 9882 |
| 8 | 39529 |
| 9 | 158118 |
| 10 | 632474 |
| 11 | 2529897 |
| 12 | 10119590 |
| 13 | 40478362 |
| 14 | 161913449 |
| 15 | 647653798 |
| 16 | 2590615194 |
| 17 | 10362460777 |
| 18 | 41449843110 |
| 19 | 165799372442 |
| 20 | 663197489769 |
| 21 | 2652789959078 |
| 22 | 10611159836314 |
| 23 | 42444639345257 |
[2,9,38,154,617,2470,9882,39529,158118,632474, 2529897,10119590,40478362,161913449,647653798, 2590615194,10362460777,41449843110,165799372442, 663197489769,2652789959078,10611159836314, 42444639345257] |