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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 46 |
| 4 | 203 |
| 5 | 906 |
| 6 | 4155 |
| 7 | 19337 |
| 8 | 90515 |
| 9 | 427945 |
| 10 | 2036396 |
| 11 | 9723892 |
| 12 | 46659238 |
| 13 | 224685811 |
| 14 | 1084448414 |
| 15 | 5248849750 |
| 16 | 25461346103 |
| 17 | 123709074355 |
| 18 | 602154572085 |
| 19 | 2935410888234 |
| 20 | 14326808679974 |
| 21 | 70012672188582 |
| 22 | 342513049583863 |
| 23 | 1677162808187506 |
| 24 | 8220070010357736 |
| 25 | 40321241043860222 |
| 26 | 197927008221279243 |
[1,3,11,46,203,906,4155,19337,90515,427945, 2036396,9723892,46659238,224685811,1084448414, 5248849750,25461346103,123709074355,602154572085, 2935410888234,14326808679974,70012672188582, 342513049583863,1677162808187506,8220070010357736, 40321241043860222,197927008221279243] |