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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 41 |
| 4 | 163 |
| 5 | 678 |
| 6 | 2908 |
| 7 | 12689 |
| 8 | 56096 |
| 9 | 251383 |
| 10 | 1139337 |
| 11 | 5208786 |
| 12 | 23965775 |
| 13 | 110924342 |
| 14 | 516254394 |
| 15 | 2414349496 |
| 16 | 11335791596 |
| 17 | 53407506243 |
| 18 | 252434493264 |
| 19 | 1196694418646 |
| 20 | 5687965950378 |
| 21 | 27098001229588 |
| 22 | 129372363727450 |
| 23 | 618882875806662 |
| 24 | 2965990345592723 |
| 25 | 14238142354747679 |
| 26 | 68454394635253561 |
[1,3,11,41,163,678,2908,12689,56096,251383, 1139337,5208786,23965775,110924342,516254394, 2414349496,11335791596,53407506243,252434493264, 1196694418646,5687965950378,27098001229588, 129372363727450,618882875806662,2965990345592723, 14238142354747679,68454394635253561] |