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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 54 |
| 3 | 482 |
| 4 | 2240 |
| 5 | 7266 |
| 6 | 18838 |
| 7 | 41938 |
| 8 | 83600 |
| 9 | 153278 |
| 10 | 263198 |
| 11 | 428718 |
| 12 | 668684 |
| 13 | 1005790 |
| 14 | 1466934 |
| 15 | 2083578 |
| 16 | 2892104 |
| 17 | 3934174 |
| 18 | 5257082 |
| 19 | 6914122 |
| 20 | 8964936 |
| 21 | 11475878 |
| 22 | 14520370 |
| 23 | 18179258 |
| 24 | 22541172 |
| 25 | 27702886 |
| 26 | 33769670 |
| 27 | 40855654 |
| 28 | 49084180 |
[2,54,482,2240,7266,18838,41938,83600,153278, 263198,428718,668684,1005790,1466934,2083578, 2892104,3934174,5257082,6914122,8964936,11475878, 14520370,18179258,22541172,27702886,33769670, 40855654,49084180] |