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| n | a(n) |
|---|---|
| 1 | 234 |
| 2 | 1028 |
| 3 | 4687 |
| 4 | 22295 |
| 5 | 105956 |
| 6 | 507049 |
| 7 | 2429173 |
| 8 | 11652188 |
| 9 | 55960799 |
| 10 | 268783174 |
| 11 | 1291581364 |
| 12 | 6207376902 |
| 13 | 29836567197 |
| 14 | 143422264585 |
| 15 | 689472936242 |
| 16 | 3314565767875 |
| 17 | 15934867914351 |
| 18 | 76608704638459 |
| 19 | 368308600684650 |
[234,1028,4687,22295,105956,507049,2429173, 11652188,55960799,268783174,1291581364,6207376902, 29836567197,143422264585,689472936242, 3314565767875,15934867914351,76608704638459, 368308600684650] |