The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 33 |
| 4 | 484 |
| 5 | 10585 |
| 6 | 323646 |
| 7 | 13129585 |
| 8 | 678943000 |
| 9 | 43470568305 |
| 10 | 3368920322170 |
| 11 | 310239261383161 |
| 12 | 33435268999158324 |
| 13 | 4163856785789863513 |
| 14 | 592763736929971545862 |
| 15 | 95571143628449891791425 |
| 16 | 17310994946723775632852656 |
| 17 | 3497748520992039001264835425 |
| 18 | 783435396067546727773400019570 |
[1,1,4,33,484,10585,323646,13129585,678943000, 43470568305,3368920322170,310239261383161, 33435268999158324,4163856785789863513, 592763736929971545862,95571143628449891791425, 17310994946723775632852656, 3497748520992039001264835425, 783435396067546727773400019570] |