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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 19 |
| 3 | 159 |
| 4 | 1546 |
| 5 | 16517 |
| 6 | 188246 |
| 7 | 2248863 |
| 8 | 27844369 |
| 9 | 354576634 |
| 10 | 4618570090 |
| 11 | 61289049293 |
| 12 | 826064774033 |
| 13 | 11281763625102 |
| 14 | 155834042142463 |
| 15 | 2173801434825011 |
| 16 | 30585769379262567 |
| 17 | 433633765794690539 |
| 18 | 6189637467948022825 |
| 19 | 88886796123324352030 |
| 20 | 1283443017706197910489 |
| 21 | 18623352714450226405962 |
[1,3,19,159,1546,16517,188246,2248863,27844369, 354576634,4618570090,61289049293,826064774033, 11281763625102,155834042142463,2173801434825011, 30585769379262567,433633765794690539, 6189637467948022825,88886796123324352030, 1283443017706197910489,18623352714450226405962] |