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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 12 |
| 3 | 37 |
| 4 | 116 |
| 5 | 372 |
| 6 | 1188 |
| 7 | 3763 |
| 8 | 11860 |
| 9 | 37261 |
| 10 | 116760 |
| 11 | 365056 |
| 12 | 1139224 |
| 13 | 3549635 |
| 14 | 11045804 |
| 15 | 34335421 |
| 16 | 106633804 |
| 17 | 330916268 |
| 18 | 1026277180 |
| 19 | 3181108619 |
| 20 | 9855901108 |
| 21 | 30524529485 |
| 22 | 94506627952 |
| 23 | 292521594048 |
| 24 | 905220237168 |
| 25 | 2800700318291 |
| 26 | 8663793207244 |
[0,3,12,37,116,372,1188,3763,11860,37261,116760, 365056,1139224,3549635,11045804,34335421, 106633804,330916268,1026277180,3181108619, 9855901108,30524529485,94506627952,292521594048, 905220237168,2800700318291,8663793207244] |