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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 2 |
| 2 | 7 |
| 3 | 12 |
| 4 | 31 |
| 5 | 70 |
| 6 | 171 |
| 7 | 408 |
| 8 | 987 |
| 9 | 2378 |
| 10 | 5743 |
| 11 | 13860 |
| 12 | 33463 |
| 13 | 80782 |
| 14 | 195027 |
| 15 | 470832 |
| 16 | 1136691 |
| 17 | 2744210 |
| 18 | 6625111 |
| 19 | 15994428 |
| 20 | 38613967 |
| 21 | 93222358 |
| 22 | 225058683 |
| 23 | 543339720 |
| 24 | 1311738123 |
| 25 | 3166815962 |
| 26 | 7645370047 |
| 27 | 18457556052 |
| 28 | 44560482151 |
| 29 | 107578520350 |
| 30 | 259717522851 |
[3,2,7,12,31,70,171,408,987,2378,5743,13860,33463, 80782,195027,470832,1136691,2744210,6625111, 15994428,38613967,93222358,225058683,543339720, 1311738123,3166815962,7645370047,18457556052, 44560482151,107578520350,259717522851] |