The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 10 | 1 |
| 11 | 10 |
| 12 | 75 |
| 13 | 495 |
| 14 | 3135 |
| 15 | 19657 |
| 16 | 120678 |
| 17 | 743321 |
| 18 | 4480240 |
| 19 | 27176489 |
| 20 | 161160411 |
| 21 | 964119615 |
| 22 | 5635200174 |
| 23 | 33302382467 |
| 24 | 192186538999 |
| 25 | 1123752073702 |
| 26 | 6413666231367 |
| 27 | 37159362571856 |
| 28 | 210072026510678 |
| 29 | 1207564204033112 |
| 30 | 6771732706003311 |
| 31 | 38664907592673960 |
| 32 | 215359228721631996 |
[1,10,75,495,3135,19657,120678,743321,4480240, 27176489,161160411,964119615,5635200174, 33302382467,192186538999,1123752073702, 6413666231367,37159362571856,210072026510678, 1207564204033112,6771732706003311, 38664907592673960,215359228721631996] |