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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 15 |
| 5 | 31 |
| 6 | 73 |
| 7 | 155 |
| 8 | 351 |
| 9 | 755 |
| 10 | 1673 |
| 11 | 3604 |
| 12 | 7897 |
| 13 | 16988 |
| 14 | 36902 |
| 15 | 79222 |
| 16 | 171030 |
| 17 | 366180 |
| 18 | 786746 |
| 19 | 1679976 |
| 20 | 3595207 |
| 21 | 7657631 |
| 22 | 16332935 |
| 23 | 34706319 |
| 24 | 73812099 |
| 25 | 156503351 |
| 26 | 332004423 |
| 27 | 702533059 |
| 28 | 1486998780 |
| 29 | 3140716766 |
| 30 | 6634315264 |
| 31 | 13988517803 |
| 32 | 29494816751 |
[1,1,3,6,15,31,73,155,351,755,1673,3604,7897, 16988,36902,79222,171030,366180,786746,1679976, 3595207,7657631,16332935,34706319,73812099, 156503351,332004423,702533059,1486998780, 3140716766,6634315264,13988517803,29494816751] |