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| n | a(n) |
|---|---|
| 4 | 13 |
| 5 | 20 |
| 6 | 31 |
| 7 | 47 |
| 8 | 70 |
| 9 | 104 |
| 10 | 154 |
| 11 | 227 |
| 12 | 334 |
| 13 | 491 |
| 14 | 721 |
| 15 | 1058 |
| 16 | 1552 |
| 17 | 2276 |
| 18 | 3337 |
| 19 | 4892 |
| 20 | 7171 |
| 21 | 10511 |
| 22 | 15406 |
| 23 | 22580 |
| 24 | 33094 |
| 25 | 48503 |
| 26 | 71086 |
| 27 | 104183 |
| 28 | 152689 |
| 29 | 223778 |
| 30 | 327964 |
| 31 | 480656 |
| 32 | 704437 |
| 33 | 1032404 |
| 34 | 1513063 |
| 35 | 2217503 |
| 36 | 3249910 |
| 37 | 4762976 |
| 38 | 6980482 |
| 39 | 10230395 |
[13,20,31,47,70,104,154,227,334,491,721,1058,1552, 2276,3337,4892,7171,10511,15406,22580,33094,48503, 71086,104183,152689,223778,327964,480656,704437, 1032404,1513063,2217503,3249910,4762976,6980482, 10230395] |