The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 2 |
| 6 | 7 |
| 7 | 13 |
| 8 | 27 |
| 9 | 52 |
| 10 | 104 |
| 11 | 210 |
| 12 | 398 |
| 13 | 807 |
| 14 | 1542 |
| 15 | 3046 |
| 16 | 5936 |
| 17 | 11565 |
| 18 | 22584 |
| 19 | 44012 |
| 20 | 86062 |
| 21 | 167786 |
| 22 | 327936 |
| 23 | 640630 |
| 24 | 1252327 |
| 25 | 2448518 |
| 26 | 4791344 |
| 27 | 9378159 |
| 28 | 18364095 |
| 29 | 35979682 |
| 30 | 70515477 |
| 31 | 138275503 |
| 32 | 271246674 |
| 33 | 532304906 |
| 34 | 1045047118 |
| 35 | 2052464984 |
| 36 | 4032502528 |
[0,0,0,0,2,2,7,13,27,52,104,210,398,807,1542,3046, 5936,11565,22584,44012,86062,167786,327936,640630, 1252327,2448518,4791344,9378159,18364095,35979682, 70515477,138275503,271246674,532304906,1045047118, 2052464984,4032502528] |