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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 10 |
| 5 | 15 |
| 6 | 22 |
| 7 | 30 |
| 8 | 39 |
| 9 | 49 |
| 10 | 60 |
| 11 | 73 |
| 12 | 87 |
| 13 | 102 |
| 14 | 118 |
| 15 | 135 |
| 16 | 154 |
| 17 | 175 |
| 18 | 197 |
| 19 | 220 |
| 20 | 245 |
| 21 | 271 |
| 22 | 298 |
| 23 | 327 |
| 24 | 358 |
| 25 | 390 |
| 26 | 423 |
| 27 | 457 |
| 28 | 492 |
| 29 | 529 |
| 30 | 567 |
| 31 | 606 |
| 32 | 647 |
| 33 | 690 |
| 34 | 734 |
| 35 | 779 |
| 36 | 825 |
| 37 | 872 |
| 38 | 921 |
| 39 | 971 |
| 40 | 1022 |
| 41 | 1074 |
| 42 | 1127 |
| 43 | 1182 |
| 44 | 1239 |
| 45 | 1297 |
| 46 | 1356 |
| 47 | 1417 |
| 48 | 1479 |
| 49 | 1542 |
| 50 | 1606 |
| 51 | 1671 |
| 52 | 1738 |
| 53 | 1806 |
| 54 | 1875 |
| 55 | 1946 |
[1,3,6,10,15,22,30,39,49,60,73,87,102,118,135,154, 175,197,220,245,271,298,327,358,390,423,457,492, 529,567,606,647,690,734,779,825,872,921,971,1022, 1074,1127,1182,1239,1297,1356,1417,1479,1542,1606, 1671,1738,1806,1875,1946] |