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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 13 |
| 6 | 27 |
| 7 | 61 |
| 8 | 133 |
| 9 | 287 |
| 10 | 633 |
| 11 | 1407 |
| 12 | 3121 |
| 13 | 6943 |
| 14 | 15517 |
| 15 | 34755 |
| 16 | 77959 |
| 17 | 175213 |
| 18 | 394499 |
| 19 | 889461 |
| 20 | 2007963 |
| 21 | 4538485 |
| 22 | 10269247 |
| 23 | 23258881 |
| 24 | 52726599 |
| 25 | 119627977 |
| 26 | 271624315 |
| 27 | 617180533 |
| 28 | 1403272799 |
| 29 | 3192557561 |
| 30 | 7267485523 |
| 31 | 16552454205 |
[1,1,1,3,7,13,27,61,133,287,633,1407,3121,6943, 15517,34755,77959,175213,394499,889461,2007963, 4538485,10269247,23258881,52726599,119627977, 271624315,617180533,1403272799,3192557561, 7267485523,16552454205] |