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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 6 |
| 5 | 7 |
| 6 | 21 |
| 7 | 28 |
| 8 | 65 |
| 9 | 93 |
| 10 | 190 |
| 11 | 283 |
| 12 | 537 |
| 13 | 820 |
| 14 | 1485 |
| 15 | 2305 |
| 16 | 4046 |
| 17 | 6351 |
| 18 | 10909 |
| 19 | 17260 |
| 20 | 29193 |
| 21 | 46453 |
| 22 | 77694 |
| 23 | 124147 |
| 24 | 205937 |
| 25 | 330084 |
| 26 | 544213 |
| 27 | 874297 |
| 28 | 1434894 |
| 29 | 2309191 |
| 30 | 3776853 |
| 31 | 6086044 |
| 32 | 9928433 |
| 33 | 16014477 |
| 34 | 26073982 |
| 35 | 42088459 |
| 36 | 68424585 |
| 37 | 110513044 |
[-1,0,1,1,6,7,21,28,65,93,190,283,537,820,1485, 2305,4046,6351,10909,17260,29193,46453,77694, 124147,205937,330084,544213,874297,1434894, 2309191,3776853,6086044,9928433,16014477,26073982, 42088459,68424585,110513044] |