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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 21 |
| 2 | 133 |
| 3 | 481 |
| 4 | 1281 |
| 5 | 2821 |
| 6 | 5461 |
| 7 | 9633 |
| 8 | 15841 |
| 9 | 24661 |
| 10 | 36741 |
| 11 | 52801 |
| 12 | 73633 |
| 13 | 100101 |
| 14 | 133141 |
| 15 | 173761 |
| 16 | 223041 |
| 17 | 282133 |
| 18 | 352261 |
| 19 | 434721 |
| 20 | 530881 |
| 21 | 642181 |
| 22 | 770133 |
| 23 | 916321 |
| 24 | 1082401 |
| 25 | 1270101 |
| 26 | 1481221 |
| 27 | 1717633 |
| 28 | 1981281 |
| 29 | 2274181 |
| 30 | 2598421 |
| 31 | 2956161 |
| 32 | 3349633 |
| 33 | 3781141 |
| 34 | 4253061 |
| 35 | 4767841 |
| 36 | 5328001 |
[1,21,133,481,1281,2821,5461,9633,15841,24661, 36741,52801,73633,100101,133141,173761,223041, 282133,352261,434721,530881,642181,770133,916321, 1082401,1270101,1481221,1717633,1981281,2274181, 2598421,2956161,3349633,3781141,4253061,4767841, 5328001] |