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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 8 |
| 2 | 38 |
| 3 | 256 |
| 4 | 1298 |
| 5 | 9792 |
| 6 | 52136 |
| 7 | 338580 |
| 8 | 1778436 |
| 9 | 11889152 |
| 10 | 62367272 |
| 11 | 414625216 |
| 12 | 2178461956 |
| 13 | 15224775552 |
| 14 | 80673299432 |
| 15 | 611106029568 |
| 16 | 2830769440776 |
| 17 | 19344856702976 |
| 18 | 115255634181184 |
| 19 | 696800841097536 |
| 20 | 3748220725527432 |
| 21 | 27388329197137920 |
| 22 | 135183433256806480 |
[3,8,38,256,1298,9792,52136,338580,1778436, 11889152,62367272,414625216,2178461956, 15224775552,80673299432,611106029568, 2830769440776,19344856702976,115255634181184, 696800841097536,3748220725527432, 27388329197137920,135183433256806480] |