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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 8 |
| 2 | 22 |
| 3 | 62 |
| 4 | 176 |
| 5 | 502 |
| 6 | 1434 |
| 7 | 4100 |
| 8 | 11726 |
| 9 | 33542 |
| 10 | 95952 |
| 11 | 274494 |
| 12 | 785266 |
| 13 | 2246484 |
| 14 | 6426742 |
| 15 | 18385646 |
| 16 | 52597744 |
| 17 | 150471910 |
| 18 | 430470890 |
| 19 | 1231493604 |
[3,8,22,62,176,502,1434,4100,11726,33542,95952, 274494,785266,2246484,6426742,18385646,52597744, 150471910,430470890,1231493604] |