The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 105 |
| 5 | 585 |
| 6 | 1041 |
| 7 | 1590 |
| 8 | 3582 |
| 9 | 5460 |
| 10 | 19425 |
| 11 | 21450 |
| 12 | 21540 |
| 13 | 33495 |
| 14 | 42315 |
| 15 | 101745 |
| 16 | 122265 |
| 17 | 151710 |
| 18 | 176190 |
| 19 | 252525 |
| 20 | 267435 |
| 21 | 318780 |
| 22 | 343800 |
| 23 | 464100 |
| 24 | 542640 |
| 25 | 868140 |
| 26 | 996765 |
| 27 | 1080450 |
| 28 | 1217370 |
| 29 | 1322685 |
| 30 | 1461495 |
| 31 | 1477875 |
| 32 | 1601985 |
| 33 | 2523675 |
| 34 | 2792790 |
| 35 | 3512145 |
[1,2,5,105,585,1041,1590,3582,5460,19425,21450, 21540,33495,42315,101745,122265,151710,176190, 252525,267435,318780,343800,464100,542640,868140, 996765,1080450,1217370,1322685,1461495,1477875, 1601985,2523675,2792790,3512145] |