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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 13 |
| 3 | 52 |
| 4 | 80 |
| 5 | 199 |
| 6 | 458 |
| 7 | 1088 |
| 8 | 2651 |
| 9 | 6257 |
| 10 | 14765 |
| 11 | 35292 |
| 12 | 84261 |
| 13 | 200040 |
| 14 | 475278 |
| 15 | 1132373 |
| 16 | 2696179 |
| 17 | 6411133 |
| 18 | 15251746 |
| 19 | 36304757 |
| 20 | 86394322 |
| 21 | 205538228 |
| 22 | 489069395 |
| 23 | 1163851093 |
| 24 | 2769397039 |
| 25 | 6589505584 |
| 26 | 15679835445 |
| 27 | 37311095302 |
| 28 | 88781699786 |
[13,13,52,80,199,458,1088,2651,6257,14765,35292, 84261,200040,475278,1132373,2696179,6411133, 15251746,36304757,86394322,205538228,489069395, 1163851093,2769397039,6589505584,15679835445, 37311095302,88781699786] |