The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 12 |
| 5 | 21 |
| 6 | 40 |
| 7 | 67 |
| 8 | 117 |
| 9 | 193 |
| 10 | 319 |
| 11 | 510 |
| 12 | 818 |
| 13 | 1274 |
| 14 | 1983 |
| 15 | 3032 |
| 16 | 4610 |
| 17 | 6915 |
| 18 | 10324 |
| 19 | 15235 |
| 20 | 22371 |
| 21 | 32554 |
| 22 | 47119 |
| 23 | 67689 |
| 24 | 96763 |
| 25 | 137404 |
| 26 | 194211 |
| 27 | 272939 |
| 28 | 381872 |
| 29 | 531576 |
| 30 | 736923 |
| 31 | 1016904 |
| 32 | 1397853 |
| 33 | 1913561 |
| 34 | 2610023 |
| 35 | 3546507 |
| 36 | 4802694 |
| 37 | 6481101 |
| 38 | 8718309 |
| 39 | 11689929 |
| 40 | 15627591 |
| 41 | 20828892 |
[1,1,3,6,12,21,40,67,117,193,319,510,818,1274, 1983,3032,4610,6915,10324,15235,22371,32554,47119, 67689,96763,137404,194211,272939,381872,531576, 736923,1016904,1397853,1913561,2610023,3546507, 4802694,6481101,8718309,11689929,15627591, 20828892] |