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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 32 |
| 5 | 164 |
| 6 | 984 |
| 7 | 6888 |
| 8 | 55110 |
| 9 | 495998 |
| 10 | 4959981 |
| 11 | 54559796 |
| 12 | 654717560 |
| 13 | 8511328289 |
| 14 | 119158596058 |
| 15 | 1787378940882 |
| 16 | 28598063054125 |
| 17 | 486167071920139 |
| 18 | 8751007294562508 |
| 19 | 166269138596687665 |
| 20 | 3325382771933753302 |
[1,2,8,32,164,984,6888,55110,495998,4959981, 54559796,654717560,8511328289,119158596058, 1787378940882,28598063054125,486167071920139, 8751007294562508,166269138596687665, 3325382771933753302] |