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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 54 |
| 3 | 750 |
| 4 | 4116 |
| 5 | 39930 |
| 6 | 92274 |
| 7 | 353736 |
| 8 | 617310 |
| 9 | 1606044 |
| 10 | 5121690 |
| 11 | 7149840 |
| 12 | 17323326 |
| 13 | 28946820 |
| 14 | 36732234 |
| 15 | 57310296 |
| 16 | 104511654 |
| 17 | 178679730 |
| 18 | 211092330 |
| 19 | 337456086 |
| 20 | 450967860 |
| 21 | 518170644 |
| 22 | 769140840 |
| 23 | 984617214 |
| 24 | 1395838620 |
[6,54,750,4116,39930,92274,353736,617310,1606044, 5121690,7149840,17323326,28946820,36732234, 57310296,104511654,178679730,211092330,337456086, 450967860,518170644,769140840,984617214, 1395838620] |