The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 12 |
| 6 | 22 |
| 7 | 36 |
| 8 | 67 |
| 9 | 122 |
| 10 | 209 |
| 11 | 377 |
| 12 | 681 |
| 13 | 1193 |
| 14 | 2130 |
| 15 | 3823 |
| 16 | 6764 |
| 17 | 12043 |
| 18 | 21531 |
| 19 | 38252 |
| 20 | 68076 |
| 21 | 121456 |
| 22 | 216126 |
| 23 | 384691 |
| 24 | 685636 |
| 25 | 1220767 |
| 26 | 2173346 |
| 27 | 3871747 |
| 28 | 6894873 |
| 29 | 12276852 |
| 30 | 21866387 |
| 31 | 38941846 |
| 32 | 69344928 |
| 33 | 123500513 |
| 34 | 219943018 |
| 35 | 391676701 |
| 36 | 697538335 |
[1,1,2,4,6,12,22,36,67,122,209,377,681,1193,2130, 3823,6764,12043,21531,38252,68076,121456,216126, 384691,685636,1220767,2173346,3871747,6894873, 12276852,21866387,38941846,69344928,123500513, 219943018,391676701,697538335] |