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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 46 |
| 4 | 202 |
| 5 | 918 |
| 6 | 4272 |
| 7 | 20146 |
| 8 | 96096 |
| 9 | 462150 |
| 10 | 2236092 |
| 11 | 10874695 |
| 12 | 53093518 |
| 13 | 260052412 |
| 14 | 1277167839 |
| 15 | 6286177214 |
| 16 | 30998213081 |
| 17 | 153099530722 |
| 18 | 757172956854 |
| 19 | 3749059996968 |
| 20 | 18581735924770 |
| 21 | 92178653535345 |
| 22 | 457622970937958 |
| 23 | 2273410063927890 |
| 24 | 11300723380227944 |
| 25 | 56203564918917070 |
| 26 | 279656667570882248 |
[1,3,11,46,202,918,4272,20146,96096,462150, 2236092,10874695,53093518,260052412,1277167839, 6286177214,30998213081,153099530722,757172956854, 3749059996968,18581735924770,92178653535345, 457622970937958,2273410063927890, 11300723380227944,56203564918917070, 279656667570882248] |