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 | 7 |
| 5 | 13 |
| 6 | 29 |
| 7 | 73 |
| 8 | 223 |
| 9 | 1201 |
| 10 | 36313 |
| 11 | 7109 |
| 12 | 45341 |
| 13 | 870517 |
| 14 | 297377 |
| 15 | 3240247 |
| 16 | 6847843 |
| 17 | 51948199 |
| 18 | 80015629 |
| 19 | 390403049 |
| 20 | 1613360743 |
| 21 | 22511523371 |
| 22 | 34121600333 |
| 23 | 162109085183 |
| 24 | 949484701001 |
| 25 | 5056628950459 |
| 26 | 23744121396563 |
| 27 | 2760884016693079 |
| 28 | 562608177258653 |
| 29 | 8107890641155673 |
[0,0,0,0,7,13,29,73,223,1201,36313,7109,45341, 870517,297377,3240247,6847843,51948199,80015629, 390403049,1613360743,22511523371,34121600333, 162109085183,949484701001,5056628950459, 23744121396563,2760884016693079,562608177258653, 8107890641155673] |