The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 18 |
| 3 | 800 |
| 4 | 183750 |
| 5 | 224042112 |
| 6 | 1475939646720 |
| 7 | 53195808994099200 |
| 8 | 10587785727897772143750 |
| 9 | 11721562427290210695200000000 |
| 10 | 72596493516095364770534596279431168 |
| 11 | 2527156530619699341247423878706695556300800 |
| 12 | 496395279097923766533851314609410101501472675840000 |
[1,2,18,800,183750,224042112,1475939646720, 53195808994099200,10587785727897772143750, 11721562427290210695200000000, 72596493516095364770534596279431168, 2527156530619699341247423878706695556300800, 49639527909792376653385131460941010150147267584000\ 0] |