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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 13 |
| 3 | 40 |
| 4 | 76 |
| 5 | 187 |
| 6 | 453 |
| 7 | 1125 |
| 8 | 2782 |
| 9 | 6843 |
| 10 | 16908 |
| 11 | 41758 |
| 12 | 103027 |
| 13 | 254329 |
| 14 | 627855 |
| 15 | 1549720 |
| 16 | 3825349 |
| 17 | 9442726 |
| 18 | 23308474 |
| 19 | 57535003 |
| 20 | 142020909 |
| 21 | 350567119 |
| 22 | 865346622 |
| 23 | 2136039825 |
| 24 | 5272643974 |
| 25 | 13015100410 |
| 26 | 32126739133 |
| 27 | 79302295311 |
| 28 | 195751392919 |
[13,13,40,76,187,453,1125,2782,6843,16908,41758, 103027,254329,627855,1549720,3825349,9442726, 23308474,57535003,142020909,350567119,865346622, 2136039825,5272643974,13015100410,32126739133, 79302295311,195751392919] |