The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 37 |
| 4 | 616 |
| 5 | 16081 |
| 6 | 605164 |
| 7 | 31011457 |
| 8 | 2076192976 |
| 9 | 175951716481 |
| 10 | 18411425885524 |
| 11 | 2331339303739777 |
| 12 | 351341718484191736 |
| 13 | 62144180030978834881 |
| 14 | 12748469150999320273084 |
| 15 | 3002313213700366145858497 |
[1,1,4,37,616,16081,605164,31011457,2076192976, 175951716481,18411425885524,2331339303739777, 351341718484191736,62144180030978834881, 12748469150999320273084,3002313213700366145858497] |