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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 4 |
| 3 | 9 |
| 4 | 20 |
| 5 | 38 |
| 6 | 69 |
| 7 | 120 |
| 8 | 204 |
| 9 | 341 |
| 10 | 564 |
| 11 | 926 |
| 12 | 1513 |
| 13 | 2464 |
| 14 | 4004 |
| 15 | 6497 |
| 16 | 10532 |
| 17 | 17062 |
| 18 | 27629 |
| 19 | 44728 |
| 20 | 72396 |
| 21 | 117165 |
| 22 | 189604 |
| 23 | 306814 |
| 24 | 496465 |
| 25 | 803328 |
| 26 | 1299844 |
| 27 | 2103225 |
| 28 | 3403124 |
| 29 | 5506406 |
| 30 | 8909589 |
| 31 | 14416056 |
| 32 | 23325708 |
| 33 | 37741829 |
| 34 | 61067604 |
| 35 | 98809502 |
[1,0,4,9,20,38,69,120,204,341,564,926,1513,2464, 4004,6497,10532,17062,27629,44728,72396,117165, 189604,306814,496465,803328,1299844,2103225, 3403124,5506406,8909589,14416056,23325708, 37741829,61067604,98809502] |