| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 3 |
| 4 | 6 |
| 5 | 5 |
| 6 | 10 |
| 7 | 10 |
| 8 | 15 |
| 9 | 15 |
| 10 | 20 |
| 11 | 21 |
| 12 | 28 |
| 13 | 28 |
| 14 | 36 |
| 15 | 35 |
| 16 | 45 |
| 17 | 45 |
| 18 | 55 |
| 19 | 55 |
| 20 | 65 |
| 21 | 66 |
| 22 | 78 |
| 23 | 78 |
| 24 | 91 |
| 25 | 90 |
| 26 | 105 |
| 27 | 105 |
| 28 | 120 |
| 29 | 120 |
| 30 | 135 |
| 31 | 136 |
| 32 | 153 |
| 33 | 153 |
| 34 | 171 |
| 35 | 170 |
| 36 | 190 |
| 37 | 190 |
| 38 | 210 |
| 39 | 210 |
| 40 | 230 |
| 41 | 231 |
| 42 | 253 |
| 43 | 253 |
| 44 | 276 |
| 45 | 275 |
| 46 | 300 |
| 47 | 300 |
| 48 | 325 |
| 49 | 325 |
| 50 | 350 |
| 51 | 351 |
| 52 | 378 |
| 53 | 378 |
| 54 | 406 |
| 55 | 405 |
[0,1,3,3,6,5,10,10,15,15,20,21,28,28,36,35,45,45, 55,55,65,66,78,78,91,90,105,105,120,120,135,136, 153,153,171,170,190,190,210,210,230,231,253,253, 276,275,300,300,325,325,350,351,378,378,406,405] |