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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 12 |
| 4 | 84 |
| 5 | 588 |
| 6 | 18228 |
| 7 | 565068 |
| 8 | 119229348 |
| 9 | 25157392428 |
| 10 | 5308209802308 |
| 11 | 1120032268286988 |
| 12 | 2588394572011229268 |
| 13 | 5981779855917950838348 |
| 14 | 179638830853071981626428788 |
| 15 | 5394733729348604680223282932428 |
| 16 | 162009248626067947151785409743745268 |
[1,2,4,12,84,588,18228,565068,119229348, 25157392428,5308209802308,1120032268286988, 2588394572011229268,5981779855917950838348, 179638830853071981626428788, 5394733729348604680223282932428, 162009248626067947151785409743745268] |