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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 17 |
| 6 | 111 |
| 7 | 156 |
| 8 | 1099 |
| 9 | 3072 |
| 10 | 21789 |
| 11 | 42334 |
| 12 | 528487 |
| 13 | 859501 |
| 14 | 8546878 |
| 15 | 31968376 |
| 16 | 159715435 |
| 17 | 398048505 |
| 18 | 5303677376 |
| 19 | 8835749346 |
| 20 | 99411964817 |
| 21 | 331215913868 |
| 22 | 1987084087016 |
| 23 | 4515860983384 |
| 24 | 62095480510303 |
[1,1,3,9,17,111,156,1099,3072,21789,42334,528487, 859501,8546878,31968376,159715435,398048505, 5303677376,8835749346,99411964817,331215913868, 1987084087016,4515860983384,62095480510303] |