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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 12 |
| 3 | 39 |
| 4 | 112 |
| 5 | 292 |
| 6 | 710 |
| 7 | 1629 |
| 8 | 3567 |
| 9 | 7505 |
| 10 | 15266 |
| 11 | 30140 |
| 12 | 57983 |
| 13 | 108981 |
| 14 | 200625 |
| 15 | 362433 |
| 16 | 643653 |
| 17 | 1125269 |
| 18 | 1939149 |
| 19 | 3297411 |
| 20 | 5538254 |
| 21 | 9195371 |
| 22 | 15104245 |
| 23 | 24561098 |
| 24 | 39562657 |
| 25 | 63160404 |
| 26 | 99987453 |
| 27 | 157029090 |
| 28 | 244754385 |
| 29 | 378754786 |
| 30 | 582124254 |
| 31 | 888874067 |
| 32 | 1348842728 |
[3,12,39,112,292,710,1629,3567,7505,15266,30140, 57983,108981,200625,362433,643653,1125269,1939149, 3297411,5538254,9195371,15104245,24561098, 39562657,63160404,99987453,157029090,244754385, 378754786,582124254,888874067,1348842728] |