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| n | a(n) |
|---|---|
| 2 | 6 |
| 3 | 26 |
| 4 | 106 |
| 5 | 330 |
| 6 | 894 |
| 7 | 2106 |
| 8 | 4490 |
| 9 | 8838 |
| 10 | 16270 |
| 11 | 28378 |
| 12 | 47224 |
| 13 | 75558 |
| 14 | 116914 |
| 15 | 175802 |
| 16 | 257658 |
| 17 | 369122 |
| 18 | 518174 |
| 19 | 714474 |
| 20 | 969236 |
| 21 | 1295946 |
| 22 | 1709766 |
| 23 | 2228746 |
| 24 | 2872862 |
| 25 | 3665350 |
[6,26,106,330,894,2106,4490,8838,16270,28378, 47224,75558,116914,175802,257658,369122,518174, 714474,969236,1295946,1709766,2228746,2872862, 3665350] |