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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 51 |
| 4 | 211 |
| 5 | 565 |
| 6 | 1221 |
| 7 | 2311 |
| 8 | 3991 |
| 9 | 6441 |
| 10 | 9865 |
| 11 | 14491 |
| 12 | 20571 |
| 13 | 28381 |
| 14 | 38221 |
| 15 | 50415 |
| 16 | 65311 |
| 17 | 83281 |
| 18 | 104721 |
| 19 | 130051 |
| 20 | 159715 |
| 21 | 194181 |
| 22 | 233941 |
| 23 | 279511 |
| 24 | 331431 |
| 25 | 390265 |
| 26 | 456601 |
| 27 | 531051 |
| 28 | 614251 |
| 29 | 706861 |
| 30 | 809565 |
| 31 | 923071 |
| 32 | 1048111 |
| 33 | 1185441 |
| 34 | 1335841 |
[1,1,51,211,565,1221,2311,3991,6441,9865,14491, 20571,28381,38221,50415,65311,83281,104721,130051, 159715,194181,233941,279511,331431,390265,456601, 531051,614251,706861,809565,923071,1048111, 1185441,1335841] |