The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 7 |
| 8 | 28 |
| 9 | 84 |
| 10 | 210 |
| 11 | 462 |
| 12 | 924 |
| 13 | 1758 |
| 14 | 3444 |
| 15 | 7602 |
| 16 | 19278 |
| 17 | 52458 |
| 18 | 142044 |
| 19 | 368130 |
| 20 | 905136 |
| 21 | 2130198 |
| 22 | 4895919 |
| 23 | 11280885 |
| 24 | 26685540 |
| 25 | 65491062 |
| 26 | 165584034 |
| 27 | 423910572 |
| 28 | 1080774261 |
| 29 | 2717940687 |
| 30 | 6731334225 |
| 31 | 16494155097 |
| 32 | 40308269022 |
[1,1,1,1,1,1,1,7,28,84,210,462,924,1758,3444,7602, 19278,52458,142044,368130,905136,2130198,4895919, 11280885,26685540,65491062,165584034,423910572, 1080774261,2717940687,6731334225,16494155097, 40308269022] |