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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 23 |
| 3 | 66 |
| 4 | 247 |
| 5 | 899 |
| 6 | 3254 |
| 7 | 11883 |
| 8 | 43207 |
| 9 | 157266 |
| 10 | 572571 |
| 11 | 2084227 |
| 12 | 7587166 |
| 13 | 27619131 |
| 14 | 100540587 |
| 15 | 365994058 |
| 16 | 1332312171 |
| 17 | 4849957923 |
| 18 | 17655092138 |
| 19 | 64269069107 |
| 20 | 233955917683 |
| 21 | 851659617442 |
| 22 | 3100259701471 |
| 23 | 11285741436475 |
| 24 | 41082996924906 |
[3,23,66,247,899,3254,11883,43207,157266,572571, 2084227,7587166,27619131,100540587,365994058, 1332312171,4849957923,17655092138,64269069107, 233955917683,851659617442,3100259701471, 11285741436475,41082996924906] |