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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 28 |
| 3 | 115 |
| 4 | 467 |
| 5 | 1880 |
| 6 | 7604 |
| 7 | 30721 |
| 8 | 124117 |
| 9 | 501512 |
| 10 | 2026304 |
| 11 | 8187195 |
| 12 | 33079959 |
| 13 | 133657824 |
| 14 | 540037688 |
| 15 | 2181994609 |
| 16 | 8816237625 |
| 17 | 35621557528 |
| 18 | 143927081684 |
| 19 | 581530015059 |
| 20 | 2349642293451 |
| 21 | 9493609553944 |
| 22 | 38358444014860 |
| 23 | 154985331853649 |
[8,28,115,467,1880,7604,30721,124117,501512, 2026304,8187195,33079959,133657824,540037688, 2181994609,8816237625,35621557528,143927081684, 581530015059,2349642293451,9493609553944, 38358444014860,154985331853649] |