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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 3 |
| 4 | 14 |
| 5 | 31 |
| 6 | 91 |
| 7 | 230 |
| 8 | 633 |
| 9 | 1685 |
| 10 | 4552 |
| 11 | 12185 |
| 12 | 32765 |
| 13 | 87980 |
| 14 | 236467 |
| 15 | 635199 |
| 16 | 1706614 |
| 17 | 4584923 |
| 18 | 12318567 |
| 19 | 33096042 |
| 20 | 88919069 |
| 21 | 238897433 |
| 22 | 641845172 |
| 23 | 1724442741 |
| 24 | 4633054817 |
| 25 | 12447607328 |
| 26 | 33442938823 |
| 27 | 89851018539 |
| 28 | 241402408354 |
[0,3,3,14,31,91,230,633,1685,4552,12185,32765, 87980,236467,635199,1706614,4584923,12318567, 33096042,88919069,238897433,641845172,1724442741, 4633054817,12447607328,33442938823,89851018539, 241402408354] |