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| n | a(n) |
|---|---|
| 2 | -1 |
| 3 | 7 |
| 4 | 21 |
| 5 | 36 |
| 6 | 51 |
| 7 | 66 |
| 8 | 81 |
| 9 | 96 |
| 10 | 111 |
| 11 | 126 |
| 12 | 141 |
| 13 | 154 |
| 14 | 171 |
| 15 | 186 |
| 16 | 201 |
| 17 | 214 |
| 18 | 231 |
| 19 | 244 |
| 20 | 261 |
| 21 | 274 |
| 22 | 291 |
| 23 | 304 |
| 24 | 321 |
| 25 | 332 |
| 26 | 351 |
| 27 | 364 |
| 28 | 381 |
| 29 | 392 |
| 30 | 411 |
| 31 | 422 |
| 32 | 441 |
| 33 | 452 |
| 34 | 471 |
| 35 | 482 |
| 36 | 501 |
| 37 | 510 |
| 38 | 531 |
| 39 | 542 |
| 40 | 561 |
| 41 | 570 |
| 42 | 591 |
| 43 | 600 |
| 44 | 621 |
| 45 | 630 |
| 46 | 651 |
| 47 | 660 |
| 48 | 681 |
| 49 | 688 |
| 50 | 711 |
| 51 | 720 |
[-1,7,21,36,51,66,81,96,111,126,141,154,171,186, 201,214,231,244,261,274,291,304,321,332,351,364, 381,392,411,422,441,452,471,482,501,510,531,542, 561,570,591,600,621,630,651,660,681,688,711,720] |