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| n | a(n) |
|---|---|
| -1 | 1 |
| 0 | 0 |
| 1 | 4 |
| 2 | 7 |
| 3 | 13 |
| 4 | 19 |
| 5 | 33 |
| 6 | 47 |
| 7 | 74 |
| 8 | 106 |
| 9 | 154 |
| 10 | 214 |
| 11 | 307 |
| 12 | 417 |
| 13 | 575 |
| 14 | 772 |
| 15 | 1045 |
| 16 | 1379 |
| 17 | 1837 |
| 18 | 2394 |
| 19 | 3135 |
| 20 | 4048 |
| 21 | 5232 |
| 22 | 6686 |
| 23 | 8560 |
| 24 | 10840 |
| 25 | 13737 |
| 26 | 17273 |
| 27 | 21701 |
| 28 | 27086 |
| 29 | 33783 |
| 30 | 41890 |
| 31 | 51893 |
| 32 | 63969 |
| 33 | 78748 |
| 34 | 96536 |
| 35 | 118196 |
| 36 | 144146 |
| 37 | 175561 |
| 38 | 213122 |
| 39 | 258327 |
| 40 | 312202 |
[1,0,4,7,13,19,33,47,74,106,154,214,307,417,575, 772,1045,1379,1837,2394,3135,4048,5232,6686,8560, 10840,13737,17273,21701,27086,33783,41890,51893, 63969,78748,96536,118196,144146,175561,213122, 258327,312202] |