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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 9 |
| 3 | 121 |
| 4 | 36481 |
| 5 | 72361 |
| 6 | 146689 |
| 7 | 259081 |
| 8 | 654481 |
| 9 | 683929 |
| 10 | 786769 |
| 11 | 1985281 |
| 12 | 2036329 |
| 13 | 3193369 |
| 14 | 3636649 |
| 15 | 3798601 |
| 16 | 4583881 |
| 17 | 5031049 |
| 18 | 5470921 |
| 19 | 5555449 |
| 20 | 6135529 |
| 21 | 6713281 |
| 22 | 7284601 |
| 23 | 7778521 |
| 24 | 16589329 |
| 25 | 20403289 |
| 26 | 21557449 |
| 27 | 22915369 |
| 28 | 26739241 |
| 29 | 27426169 |
| 30 | 30261001 |
| 31 | 30591961 |
[4,9,121,36481,72361,146689,259081,654481,683929, 786769,1985281,2036329,3193369,3636649,3798601, 4583881,5031049,5470921,5555449,6135529,6713281, 7284601,7778521,16589329,20403289,21557449, 22915369,26739241,27426169,30261001,30591961] |