The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 23 |
| 5 | 54 |
| 6 | 137 |
| 7 | 297 |
| 8 | 659 |
| 9 | 1355 |
| 10 | 2765 |
| 11 | 5332 |
| 12 | 10315 |
| 13 | 19040 |
| 14 | 34917 |
| 15 | 62302 |
| 16 | 110129 |
| 17 | 190065 |
| 18 | 325844 |
| 19 | 547683 |
| 20 | 913936 |
| 21 | 1502371 |
| 22 | 2450281 |
| 23 | 3945459 |
| 24 | 6312470 |
| 25 | 9986624 |
| 26 | 15696792 |
| 27 | 24445887 |
| 28 | 37838409 |
| 29 | 58085458 |
| 30 | 88678438 |
| 31 | 134386804 |
| 32 | 202593273 |
| 33 | 303451589 |
| 34 | 452267587 |
[1,1,3,8,23,54,137,297,659,1355,2765,5332,10315, 19040,34917,62302,110129,190065,325844,547683, 913936,1502371,2450281,3945459,6312470,9986624, 15696792,24445887,37838409,58085458,88678438, 134386804,202593273,303451589,452267587] |