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 | 7 |
| 6 | 19 |
| 7 | 46 |
| 8 | 107 |
| 9 | 242 |
| 10 | 535 |
| 11 | 1162 |
| 12 | 2490 |
| 13 | 5281 |
| 14 | 11108 |
| 15 | 23206 |
| 16 | 48206 |
| 17 | 99663 |
| 18 | 205218 |
| 19 | 421115 |
| 20 | 861585 |
| 21 | 1758249 |
| 22 | 3580075 |
| 23 | 7275377 |
| 24 | 14759592 |
| 25 | 29897683 |
| 26 | 60481359 |
| 27 | 122206014 |
| 28 | 246665382 |
| 29 | 497414751 |
| 30 | 1002231335 |
| 31 | 2017877779 |
| 32 | 4060069150 |
| 33 | 8164204342 |
[0,0,0,0,2,7,19,46,107,242,535,1162,2490,5281, 11108,23206,48206,99663,205218,421115,861585, 1758249,3580075,7275377,14759592,29897683, 60481359,122206014,246665382,497414751,1002231335, 2017877779,4060069150,8164204342] |