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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 6 |
| 7 | 8 |
| 8 | 11 |
| 9 | 14 |
| 10 | 18 |
| 11 | 22 |
| 12 | 26 |
| 13 | 31 |
| 14 | 36 |
| 15 | 42 |
| 16 | 48 |
| 17 | 54 |
| 18 | 61 |
| 19 | 68 |
| 20 | 76 |
| 21 | 84 |
| 22 | 92 |
| 23 | 101 |
| 24 | 110 |
| 25 | 120 |
| 26 | 130 |
| 27 | 140 |
| 28 | 151 |
| 29 | 162 |
| 30 | 174 |
| 31 | 186 |
| 32 | 198 |
| 33 | 211 |
| 34 | 224 |
| 35 | 238 |
| 36 | 252 |
| 37 | 266 |
| 38 | 281 |
| 39 | 296 |
| 40 | 312 |
| 41 | 328 |
| 42 | 344 |
| 43 | 361 |
| 44 | 378 |
| 45 | 396 |
| 46 | 414 |
| 47 | 432 |
| 48 | 451 |
| 49 | 470 |
| 50 | 490 |
| 51 | 510 |
| 52 | 530 |
| 53 | 551 |
| 54 | 572 |
| 55 | 594 |
| 56 | 616 |
| 57 | 638 |
| 58 | 661 |
| 59 | 684 |
[0,0,0,1,2,4,6,8,11,14,18,22,26,31,36,42,48,54,61, 68,76,84,92,101,110,120,130,140,151,162,174,186, 198,211,224,238,252,266,281,296,312,328,344,361, 378,396,414,432,451,470,490,510,530,551,572,594, 616,638,661,684] |