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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 21 |
| 4 | 41 |
| 5 | 71 |
| 6 | 113 |
| 7 | 169 |
| 8 | 241 |
| 9 | 331 |
| 10 | 441 |
| 11 | 573 |
| 12 | 729 |
| 13 | 911 |
| 14 | 1121 |
| 15 | 1361 |
| 16 | 1633 |
| 17 | 1939 |
| 18 | 2281 |
| 19 | 2661 |
| 20 | 3081 |
| 21 | 3543 |
| 22 | 4049 |
| 23 | 4601 |
| 24 | 5201 |
| 25 | 5851 |
| 26 | 6553 |
| 27 | 7309 |
| 28 | 8121 |
| 29 | 8991 |
| 30 | 9921 |
| 31 | 10913 |
| 32 | 11969 |
| 33 | 13091 |
| 34 | 14281 |
| 35 | 15541 |
| 36 | 16873 |
| 37 | 18279 |
| 38 | 19761 |
| 39 | 21321 |
| 40 | 22961 |
| 41 | 24683 |
[1,3,9,21,41,71,113,169,241,331,441,573,729,911, 1121,1361,1633,1939,2281,2661,3081,3543,4049,4601, 5201,5851,6553,7309,8121,8991,9921,10913,11969, 13091,14281,15541,16873,18279,19761,21321,22961, 24683] |