| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 4 |
| 6 | 9 |
| 7 | 14 |
| 8 | 28 |
| 9 | 47 |
| 10 | 89 |
| 11 | 155 |
| 12 | 286 |
| 13 | 507 |
| 14 | 924 |
| 15 | 1652 |
| 16 | 2993 |
| 17 | 5373 |
| 18 | 9707 |
| 19 | 17460 |
| 20 | 31501 |
| 21 | 56714 |
| 22 | 102256 |
| 23 | 184183 |
| 24 | 331981 |
| 25 | 598091 |
| 26 | 1077870 |
| 27 | 1942071 |
| 28 | 3499720 |
| 29 | 6305992 |
| 30 | 11363361 |
| 31 | 20475625 |
| 32 | 36896355 |
| 33 | 66484244 |
| 34 | 119801329 |
| 35 | 215873462 |
| 36 | 388991876 |
| 37 | 700937471 |
[0,0,1,1,3,4,9,14,28,47,89,155,286,507,924,1652, 2993,5373,9707,17460,31501,56714,102256,184183, 331981,598091,1077870,1942071,3499720,6305992, 11363361,20475625,36896355,66484244,119801329, 215873462,388991876,700937471] |