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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 30 |
| 5 | 97 |
| 6 | 389 |
| 7 | 1441 |
| 8 | 5889 |
| 9 | 23616 |
| 10 | 99002 |
| 11 | 413417 |
| 12 | 1776811 |
| 13 | 7615131 |
| 14 | 33341337 |
| 15 | 145808687 |
| 16 | 647319019 |
| 17 | 2875484141 |
| 18 | 12912706883 |
| 19 | 58054041349 |
| 20 | 263234386877 |
| 21 | 1194949733310 |
| 22 | 5462241787614 |
| 23 | 24996707232914 |
| 24 | 115041699718214 |
| 25 | 530075704218794 |
| 26 | 2453825498716578 |
| 27 | 11372606980198438 |
| 28 | 52914248724872906 |
[1,1,3,8,30,97,389,1441,5889,23616,99002,413417, 1776811,7615131,33341337,145808687,647319019, 2875484141,12912706883,58054041349,263234386877, 1194949733310,5462241787614,24996707232914, 115041699718214,530075704218794,2453825498716578, 11372606980198438,52914248724872906] |