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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 9 |
| 3 | 30 |
| 4 | 38 |
| 5 | 285 |
| 6 | 339 |
| 7 | 2912 |
| 8 | 6684 |
| 9 | 22635 |
| 10 | 25145 |
| 11 | 304854 |
| 12 | 332562 |
| 13 | 4684589 |
| 14 | 5044935 |
| 15 | 5405280 |
| 16 | 11531384 |
| 17 | 208287927 |
| 18 | 220540149 |
| 19 | 4423058450 |
| 20 | 4655850990 |
| 21 | 4888643529 |
| 22 | 5121436067 |
| 23 | 123147263964 |
| 24 | 128501492820 |
| 25 | 669278609675 |
| 26 | 696049754049 |
| 27 | 2168462696022 |
| 28 | 2248776129194 |
[2,9,30,38,285,339,2912,6684,22635,25145,304854, 332562,4684589,5044935,5405280,11531384,208287927, 220540149,4423058450,4655850990,4888643529, 5121436067,123147263964,128501492820,669278609675, 696049754049,2168462696022,2248776129194] |