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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 15 |
| 4 | 148 |
| 5 | 739 |
| 6 | 1538 |
| 7 | 19458 |
| 8 | 99290 |
| 9 | 199245 |
| 10 | 2737170 |
| 11 | 14308328 |
| 12 | 28263858 |
| 13 | 406132996 |
| 14 | 2157586976 |
| 15 | 4223483322 |
| 16 | 62496247170 |
| 17 | 335699045124 |
| 18 | 653268735784 |
| 19 | 9869313704764 |
| 20 | 53437060321924 |
| 21 | 103559574448252 |
| 22 | 1588892060781914 |
[1,6,15,148,739,1538,19458,99290,199245,2737170, 14308328,28263858,406132996,2157586976,4223483322, 62496247170,335699045124,653268735784, 9869313704764,53437060321924,103559574448252, 1588892060781914] |