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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 7 |
| 5 | 13 |
| 6 | 19 |
| 7 | 61 |
| 8 | 145 |
| 9 | 301 |
| 10 | 745 |
| 11 | 1729 |
| 12 | 4447 |
| 13 | 10585 |
| 14 | 25327 |
| 15 | 62569 |
| 16 | 156049 |
| 17 | 382513 |
| 18 | 928369 |
| 19 | 2288329 |
| 20 | 5862367 |
| 21 | 14587717 |
| 22 | 35951587 |
| 23 | 90006229 |
| 24 | 231398497 |
| 25 | 580975885 |
| 26 | 1450005841 |
| 27 | 3655134145 |
| 28 | 9449479159 |
| 29 | 23897176753 |
| 30 | 60127243687 |
| 31 | 152755139617 |
[1,1,1,7,13,19,61,145,301,745,1729,4447,10585, 25327,62569,156049,382513,928369,2288329,5862367, 14587717,35951587,90006229,231398497,580975885, 1450005841,3655134145,9449479159,23897176753, 60127243687,152755139617] |