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| n | a(n) |
|---|---|
| 0 | 9 |
| 1 | 53 |
| 2 | 181 |
| 3 | 465 |
| 4 | 1001 |
| 5 | 1909 |
| 6 | 3333 |
| 7 | 5441 |
| 8 | 8425 |
| 9 | 12501 |
| 10 | 17909 |
| 11 | 24913 |
| 12 | 33801 |
| 13 | 44885 |
| 14 | 58501 |
| 15 | 75009 |
| 16 | 94793 |
| 17 | 118261 |
| 18 | 145845 |
| 19 | 178001 |
| 20 | 215209 |
| 21 | 257973 |
| 22 | 306821 |
| 23 | 362305 |
| 24 | 425001 |
| 25 | 495509 |
| 26 | 574453 |
| 27 | 662481 |
| 28 | 760265 |
| 29 | 868501 |
| 30 | 987909 |
| 31 | 1119233 |
| 32 | 1263241 |
[9,53,181,465,1001,1909,3333,5441,8425,12501, 17909,24913,33801,44885,58501,75009,94793,118261, 145845,178001,215209,257973,306821,362305,425001, 495509,574453,662481,760265,868501,987909,1119233, 1263241] |