The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 16 |
| 3 | 30 |
| 4 | 64 |
| 5 | 195 |
| 6 | 625 |
| 7 | 2580 |
| 8 | 8836 |
| 9 | 34903 |
| 10 | 148996 |
| 11 | 629880 |
| 12 | 2722500 |
| 13 | 12034106 |
| 14 | 53304601 |
| 15 | 238715100 |
| 16 | 1069617025 |
| 17 | 4811385635 |
| 18 | 21685802121 |
| 19 | 97859055714 |
| 20 | 441832737025 |
| 21 | 1996456911552 |
| 22 | 9023583429184 |
| 23 | 40798463142960 |
| 24 | 184481127958689 |
[1,16,30,64,195,625,2580,8836,34903,148996,629880, 2722500,12034106,53304601,238715100,1069617025, 4811385635,21685802121,97859055714,441832737025, 1996456911552,9023583429184,40798463142960, 184481127958689] |