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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 30 |
| 3 | 204 |
| 4 | 966 |
| 5 | 5748 |
| 6 | 29388 |
| 7 | 169944 |
| 8 | 886278 |
| 9 | 5169732 |
| 10 | 27794820 |
| 11 | 162920616 |
| 12 | 894445212 |
| 13 | 5274022920 |
| 14 | 29398573272 |
| 15 | 174041671344 |
| 16 | 980746798278 |
| 17 | 5821525480164 |
| 18 | 33071756442708 |
| 19 | 196663513473672 |
| 20 | 1124154722216244 |
| 21 | 6693497121210648 |
| 22 | 38448301937075112 |
| 23 | 229149691659210192 |
[1,6,30,204,966,5748,29388,169944,886278,5169732, 27794820,162920616,894445212,5274022920, 29398573272,174041671344,980746798278, 5821525480164,33071756442708,196663513473672, 1124154722216244,6693497121210648, 38448301937075112,229149691659210192] |