The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 14 |
| 5 | 30 |
| 6 | 148 |
| 7 | 744 |
| 8 | 4610 |
| 9 | 32870 |
| 10 | 266972 |
| 11 | 2431608 |
| 12 | 24554194 |
| 13 | 272289630 |
| 14 | 3289836260 |
| 15 | 43017800312 |
| 16 | 605289111698 |
| 17 | 9119314568454 |
| 18 | 146474344313980 |
| 19 | 2498617856687400 |
[1,14,30,148,744,4610,32870,266972,2431608, 24554194,272289630,3289836260,43017800312, 605289111698,9119314568454,146474344313980, 2498617856687400] |