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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 9 |
| 5 | 12 |
| 6 | 16 |
| 7 | 20 |
| 8 | 25 |
| 9 | 30 |
| 10 | 35 |
| 11 | 40 |
| 12 | 45 |
| 13 | 51 |
| 14 | 57 |
| 15 | 63 |
| 16 | 70 |
| 17 | 77 |
| 18 | 84 |
| 19 | 91 |
| 20 | 98 |
| 21 | 105 |
| 22 | 112 |
| 23 | 120 |
| 24 | 128 |
| 25 | 136 |
| 26 | 144 |
| 27 | 153 |
| 28 | 162 |
| 29 | 171 |
| 30 | 180 |
| 31 | 189 |
| 32 | 198 |
| 33 | 207 |
| 34 | 216 |
| 35 | 225 |
| 36 | 235 |
| 37 | 245 |
| 38 | 255 |
| 39 | 265 |
| 40 | 275 |
| 41 | 286 |
| 42 | 297 |
| 43 | 308 |
| 44 | 319 |
| 45 | 330 |
| 46 | 341 |
| 47 | 352 |
| 48 | 363 |
| 49 | 374 |
| 50 | 385 |
| 51 | 396 |
| 52 | 408 |
| 53 | 420 |
| 54 | 432 |
| 55 | 444 |
| 56 | 456 |
[0,1,3,6,9,12,16,20,25,30,35,40,45,51,57,63,70,77, 84,91,98,105,112,120,128,136,144,153,162,171,180, 189,198,207,216,225,235,245,255,265,275,286,297, 308,319,330,341,352,363,374,385,396,408,420,432, 444,456] |