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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 38 |
| 4 | 152 |
| 5 | 639 |
| 6 | 2771 |
| 7 | 12281 |
| 8 | 55420 |
| 9 | 253364 |
| 10 | 1171092 |
| 11 | 5460007 |
| 12 | 25639273 |
| 13 | 121123086 |
| 14 | 575076889 |
| 15 | 2742195363 |
| 16 | 13124176867 |
| 17 | 63014222585 |
| 18 | 303403995443 |
| 19 | 1464445137864 |
| 20 | 7083898807342 |
| 21 | 34333188959553 |
| 22 | 166690360145487 |
| 23 | 810559968736787 |
| 24 | 3947049979314502 |
| 25 | 19244917231144970 |
| 26 | 93943277175860158 |
[1,3,10,38,152,639,2771,12281,55420,253364, 1171092,5460007,25639273,121123086,575076889, 2742195363,13124176867,63014222585,303403995443, 1464445137864,7083898807342,34333188959553, 166690360145487,810559968736787,3947049979314502, 19244917231144970,93943277175860158] |