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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 15 |
| 5 | 26 |
| 6 | 43 |
| 7 | 81 |
| 8 | 138 |
| 9 | 218 |
| 10 | 320 |
| 11 | 514 |
| 12 | 751 |
| 13 | 1131 |
| 14 | 1570 |
| 15 | 2319 |
| 16 | 3159 |
| 17 | 4457 |
| 18 | 6077 |
| 19 | 8344 |
| 20 | 11224 |
| 21 | 15337 |
| 22 | 20297 |
| 23 | 26908 |
| 24 | 35773 |
| 25 | 46434 |
| 26 | 60711 |
| 27 | 78433 |
| 28 | 100987 |
| 29 | 129222 |
| 30 | 166590 |
| 31 | 209719 |
| 32 | 267120 |
| 33 | 335842 |
| 34 | 423341 |
| 35 | 527739 |
| 36 | 659974 |
| 37 | 816805 |
| 38 | 1015990 |
| 39 | 1251686 |
| 40 | 1543864 |
[0,1,3,6,15,26,43,81,138,218,320,514,751,1131, 1570,2319,3159,4457,6077,8344,11224,15337,20297, 26908,35773,46434,60711,78433,100987,129222, 166590,209719,267120,335842,423341,527739,659974, 816805,1015990,1251686,1543864] |