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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 12 |
| 5 | 47 |
| 6 | 217 |
| 7 | 513 |
| 8 | 730 |
| 9 | 927 |
| 10 | 1001 |
| 11 | 1250 |
| 12 | 1432 |
| 13 | 2618 |
| 14 | 3160 |
| 15 | 3501 |
| 16 | 9450 |
| 17 | 17708 |
| 18 | 19350 |
| 19 | 258092 |
| 20 | 446171 |
| 21 | 758328 |
| 22 | 1162615 |
| 23 | 1397512 |
| 24 | 2050161 |
| 25 | 2489701 |
| 26 | 4388442 |
| 27 | 4682839 |
| 28 | 26449444 |
| 29 | 55809643 |
| 30 | 59687200 |
| 31 | 88684158 |
[2,4,9,12,47,217,513,730,927,1001,1250,1432,2618, 3160,3501,9450,17708,19350,258092,446171,758328, 1162615,1397512,2050161,2489701,4388442,4682839, 26449444,55809643,59687200,88684158] |