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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 61 |
| 5 | 249 |
| 6 | 1003 |
| 7 | 4115 |
| 8 | 17371 |
| 9 | 73519 |
| 10 | 315575 |
| 11 | 1367431 |
| 12 | 5946949 |
| 13 | 26092679 |
| 14 | 115017031 |
| 15 | 508924409 |
| 16 | 2263672565 |
| 17 | 10098869293 |
| 18 | 45205624797 |
| 19 | 203017643007 |
| 20 | 913862154449 |
| 21 | 4124692123161 |
| 22 | 18658670407501 |
| 23 | 84569931164973 |
| 24 | 384100732416711 |
| 25 | 1747491307163059 |
| 26 | 7963465982266133 |
| 27 | 36348101856151661 |
[1,1,5,17,61,249,1003,4115,17371,73519,315575, 1367431,5946949,26092679,115017031,508924409, 2263672565,10098869293,45205624797,203017643007, 913862154449,4124692123161,18658670407501, 84569931164973,384100732416711,1747491307163059, 7963465982266133,36348101856151661] |