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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 13 |
| 4 | 59 |
| 5 | 197 |
| 6 | 915 |
| 7 | 3325 |
| 8 | 15733 |
| 9 | 60317 |
| 10 | 288181 |
| 11 | 1145295 |
| 12 | 5509487 |
| 13 | 22451225 |
| 14 | 108586043 |
| 15 | 450783555 |
| 16 | 2189360465 |
| 17 | 9221321187 |
| 18 | 44933067763 |
| 19 | 191465798107 |
| 20 | 935415358939 |
| 21 | 4024318272885 |
| 22 | 19703027140807 |
| 23 | 85451890605353 |
| 24 | 419111032544665 |
| 25 | 1830233351140337 |
| 26 | 8989990703932397 |
| 27 | 39492923551242959 |
[1,1,5,13,59,197,915,3325,15733,60317,288181, 1145295,5509487,22451225,108586043,450783555, 2189360465,9221321187,44933067763,191465798107, 935415358939,4024318272885,19703027140807, 85451890605353,419111032544665,1830233351140337, 8989990703932397,39492923551242959] |