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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 40 |
| 4 | 931 |
| 5 | 3871 |
| 6 | 91180 |
| 7 | 379270 |
| 8 | 8934661 |
| 9 | 37164541 |
| 10 | 875505550 |
| 11 | 3641745700 |
| 12 | 85790609191 |
| 13 | 356853914011 |
| 14 | 8406604195120 |
| 15 | 34968041827330 |
| 16 | 823761420512521 |
| 17 | 3426511245164281 |
| 18 | 80720212606031890 |
| 19 | 335763133984272160 |
| 20 | 7909757073970612651 |
| 21 | 32901360619213507351 |
[1,10,40,931,3871,91180,379270,8934661,37164541, 875505550,3641745700,85790609191,356853914011, 8406604195120,34968041827330,823761420512521, 3426511245164281,80720212606031890, 335763133984272160,7909757073970612651, 32901360619213507351] |