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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 8 |
| 3 | 11 |
| 4 | 24 |
| 5 | 61 |
| 6 | 121 |
| 7 | 270 |
| 8 | 614 |
| 9 | 1296 |
| 10 | 2973 |
| 11 | 6574 |
| 12 | 14527 |
| 13 | 32621 |
| 14 | 72032 |
| 15 | 160402 |
| 16 | 357304 |
| 17 | 792903 |
| 18 | 1765982 |
| 19 | 3926185 |
| 20 | 8727963 |
| 21 | 19420018 |
| 22 | 43174998 |
| 23 | 96024756 |
| 24 | 213571465 |
| 25 | 474912978 |
| 26 | 1056243677 |
| 27 | 2348975193 |
| 28 | 5223841988 |
| 29 | 11617743070 |
| 30 | 25836617638 |
[2,8,11,24,61,121,270,614,1296,2973,6574,14527, 32621,72032,160402,357304,792903,1765982,3926185, 8727963,19420018,43174998,96024756,213571465, 474912978,1056243677,2348975193,5223841988, 11617743070,25836617638] |