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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 2 |
| 5 | 10 |
| 6 | 11 |
| 7 | 21 |
| 8 | 50 |
| 9 | 66 |
| 10 | 152 |
| 11 | 275 |
| 12 | 467 |
| 13 | 988 |
| 14 | 1717 |
| 15 | 3283 |
| 16 | 6386 |
| 17 | 11560 |
| 18 | 22556 |
| 19 | 42465 |
| 20 | 79832 |
| 21 | 154122 |
| 22 | 290039 |
| 23 | 554323 |
| 24 | 1060259 |
| 25 | 2012310 |
| 26 | 3859286 |
| 27 | 7365423 |
| 28 | 14072333 |
| 29 | 26980788 |
| 30 | 51580271 |
| 31 | 98873291 |
| 32 | 189567090 |
| 33 | 363277676 |
| 34 | 697348910 |
[0,2,3,2,10,11,21,50,66,152,275,467,988,1717,3283, 6386,11560,22556,42465,79832,154122,290039,554323, 1060259,2012310,3859286,7365423,14072333,26980788, 51580271,98873291,189567090,363277676,697348910] |