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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 2 |
| 5 | 3 |
| 6 | 6 |
| 7 | 12 |
| 8 | 23 |
| 9 | 26 |
| 10 | 108 |
| 11 | 196 |
| 12 | 457 |
| 13 | 1194 |
| 14 | 2941 |
| 15 | 6996 |
| 16 | 18466 |
| 17 | 44700 |
| 18 | 115222 |
| 19 | 290209 |
| 20 | 743380 |
| 21 | 1902091 |
| 22 | 4927667 |
| 23 | 12687155 |
| 24 | 33111341 |
| 25 | 86087218 |
| 26 | 225487899 |
| 27 | 590898052 |
| 28 | 1554720401 |
| 29 | 4094006743 |
| 30 | 10817803375 |
| 31 | 28602497093 |
[0,2,3,6,12,23,26,108,196,457,1194,2941,6996, 18466,44700,115222,290209,743380,1902091,4927667, 12687155,33111341,86087218,225487899,590898052, 1554720401,4094006743,10817803375,28602497093] |