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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 29 |
| 5 | 70 |
| 6 | 181 |
| 7 | 435 |
| 8 | 1046 |
| 9 | 2470 |
| 10 | 5762 |
| 11 | 13283 |
| 12 | 30371 |
| 13 | 68847 |
| 14 | 154935 |
| 15 | 346433 |
| 16 | 770154 |
| 17 | 1703152 |
| 18 | 3748574 |
| 19 | 8214805 |
| 20 | 17931172 |
| 21 | 38997819 |
| 22 | 84531066 |
| 23 | 182661514 |
| 24 | 393578129 |
| 25 | 845777569 |
| 26 | 1813017039 |
| 27 | 3877390908 |
| 28 | 8274351482 |
| 29 | 17621535902 |
| 30 | 37456091552 |
| 31 | 79472869966 |
[0,1,4,10,29,70,181,435,1046,2470,5762,13283, 30371,68847,154935,346433,770154,1703152,3748574, 8214805,17931172,38997819,84531066,182661514, 393578129,845777569,1813017039,3877390908, 8274351482,17621535902,37456091552,79472869966] |