The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 32 |
| 4 | 301 |
| 5 | 3132 |
| 6 | 47764 |
| 7 | 823552 |
| 8 | 16847478 |
| 9 | 387440943 |
| 10 | 10009869956 |
| 11 | 285311670624 |
| 12 | 8918297605544 |
| 13 | 302875106592268 |
| 14 | 11112685154884700 |
| 15 | 437893920913552704 |
| 16 | 18447025557293175687 |
| 17 | 827240261886336764196 |
| 18 | 39346558271690970332766 |
| 19 | 1978419655660313589124000 |
[1,8,32,301,3132,47764,823552,16847478,387440943, 10009869956,285311670624,8918297605544, 302875106592268,11112685154884700, 437893920913552704,18447025557293175687, 827240261886336764196,39346558271690970332766, 1978419655660313589124000] |