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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 81 |
| 2 | 321 |
| 3 | 721 |
| 4 | 1281 |
| 5 | 2001 |
| 6 | 2881 |
| 7 | 3921 |
| 8 | 5121 |
| 9 | 6481 |
| 10 | 8001 |
| 11 | 9681 |
| 12 | 11521 |
| 13 | 13521 |
| 14 | 15681 |
| 15 | 18001 |
| 16 | 20481 |
| 17 | 23121 |
| 18 | 25921 |
| 19 | 28881 |
| 20 | 32001 |
| 21 | 35281 |
| 22 | 38721 |
| 23 | 42321 |
| 24 | 46081 |
| 25 | 50001 |
| 26 | 54081 |
| 27 | 58321 |
| 28 | 62721 |
| 29 | 67281 |
| 30 | 72001 |
| 31 | 76881 |
| 32 | 81921 |
| 33 | 87121 |
| 34 | 92481 |
| 35 | 98001 |
| 36 | 103681 |
| 37 | 109521 |
| 38 | 115521 |
| 39 | 121681 |
[1,81,321,721,1281,2001,2881,3921,5121,6481,8001, 9681,11521,13521,15681,18001,20481,23121,25921, 28881,32001,35281,38721,42321,46081,50001,54081, 58321,62721,67281,72001,76881,81921,87121,92481, 98001,103681,109521,115521,121681] |