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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 19 |
| 4 | 54 |
| 5 | 134 |
| 6 | 354 |
| 7 | 838 |
| 8 | 2057 |
| 9 | 4794 |
| 10 | 11232 |
| 11 | 25412 |
| 12 | 58075 |
| 13 | 128670 |
| 14 | 286152 |
| 15 | 625829 |
| 16 | 1365653 |
| 17 | 2941088 |
| 18 | 6331146 |
| 19 | 13474533 |
| 20 | 28642325 |
| 21 | 60404681 |
| 22 | 127082128 |
| 23 | 265712673 |
| 24 | 554608226 |
| 25 | 1151374963 |
| 26 | 2385950536 |
| 27 | 4924685252 |
| 28 | 10145267212 |
| 29 | 20831428273 |
| 30 | 42708248451 |
[1,2,7,19,54,134,354,838,2057,4794,11232,25412, 58075,128670,286152,625829,1365653,2941088, 6331146,13474533,28642325,60404681,127082128, 265712673,554608226,1151374963,2385950536, 4924685252,10145267212,20831428273,42708248451] |