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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 19 |
| 4 | 64 |
| 5 | 206 |
| 6 | 616 |
| 7 | 1766 |
| 8 | 4836 |
| 9 | 12910 |
| 10 | 33248 |
| 11 | 83768 |
| 12 | 205693 |
| 13 | 495357 |
| 14 | 1169030 |
| 15 | 2713262 |
| 16 | 6193247 |
| 17 | 13932454 |
| 18 | 30905452 |
| 19 | 67684181 |
| 20 | 146439145 |
| 21 | 313266730 |
| 22 | 663004212 |
| 23 | 1389106622 |
| 24 | 2882712626 |
| 25 | 5928222338 |
| 26 | 12086570971 |
| 27 | 24440494114 |
| 28 | 49035791349 |
| 29 | 97646904849 |
[0,1,5,19,64,206,616,1766,4836,12910,33248,83768, 205693,495357,1169030,2713262,6193247,13932454, 30905452,67684181,146439145,313266730,663004212, 1389106622,2882712626,5928222338,12086570971, 24440494114,49035791349,97646904849] |