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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 13 |
| 4 | 63 |
| 5 | 203 |
| 6 | 1007 |
| 7 | 3611 |
| 8 | 17981 |
| 9 | 68397 |
| 10 | 341145 |
| 11 | 1350105 |
| 12 | 6740921 |
| 13 | 27424021 |
| 14 | 137005923 |
| 15 | 569013889 |
| 16 | 2843565991 |
| 17 | 11999840845 |
| 18 | 59979114067 |
| 19 | 256350760835 |
| 20 | 1281478284811 |
| 21 | 5534183773599 |
| 22 | 27667000811205 |
| 23 | 120518388346869 |
| 24 | 602535467795435 |
| 25 | 2643882222857753 |
| 26 | 13218582405778545 |
| 27 | 58365699035871815 |
[1,1,5,13,63,203,1007,3611,17981,68397,341145, 1350105,6740921,27424021,137005923,569013889, 2843565991,11999840845,59979114067,256350760835, 1281478284811,5534183773599,27667000811205, 120518388346869,602535467795435,2643882222857753, 13218582405778545,58365699035871815] |