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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 30 |
| 4 | 276 |
| 5 | 3130 |
| 6 | 46914 |
| 7 | 823550 |
| 8 | 16781384 |
| 9 | 387421227 |
| 10 | 10000100110 |
| 11 | 285311670622 |
| 12 | 8916103456860 |
| 13 | 302875106592266 |
| 14 | 11112006930971730 |
| 15 | 437893890381622140 |
| 16 | 18446744078004584720 |
| 17 | 827240261886336764194 |
| 18 | 39346408075494930884190 |
| 19 | 1978419655660313589123998 |
[1,6,30,276,3130,46914,823550,16781384,387421227, 10000100110,285311670622,8916103456860, 302875106592266,11112006930971730, 437893890381622140,18446744078004584720, 827240261886336764194,39346408075494930884190, 1978419655660313589123998] |