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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 7 |
| 4 | 19 |
| 5 | 35 |
| 6 | 80 |
| 7 | 149 |
| 8 | 307 |
| 9 | 566 |
| 10 | 1092 |
| 11 | 1974 |
| 12 | 3643 |
| 13 | 6447 |
| 14 | 11498 |
| 15 | 19947 |
| 16 | 34636 |
| 17 | 58974 |
| 18 | 100182 |
| 19 | 167713 |
| 20 | 279659 |
| 21 | 461056 |
| 22 | 756562 |
| 23 | 1230104 |
| 24 | 1990255 |
| 25 | 3195471 |
| 26 | 5105540 |
| 27 | 8103722 |
| 28 | 12801925 |
| 29 | 20107448 |
| 30 | 31439978 |
| 31 | 48907179 |
| 32 | 75755094 |
| 33 | 116797754 |
| 34 | 179354540 |
| 35 | 274253042 |
[1,1,4,7,19,35,80,149,307,566,1092,1974,3643,6447, 11498,19947,34636,58974,100182,167713,279659, 461056,756562,1230104,1990255,3195471,5105540, 8103722,12801925,20107448,31439978,48907179, 75755094,116797754,179354540,274253042] |