The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 28 |
| 3 | 232 |
| 4 | 2092 |
| 5 | 19864 |
| 6 | 195352 |
| 7 | 1970896 |
| 8 | 20275660 |
| 9 | 211823800 |
| 10 | 2240795888 |
| 11 | 23951292204 |
| 12 | 258255572584 |
| 13 | 2805537209648 |
| 14 | 30675548482880 |
| 15 | 337307986673572 |
| 16 | 3727607821613388 |
| 17 | 41377406950962504 |
| 18 | 461130952671387592 |
| 19 | 5157535231753964268 |
[1,4,28,232,2092,19864,195352,1970896,20275660, 211823800,2240795888,23951292204,258255572584, 2805537209648,30675548482880,337307986673572, 3727607821613388,41377406950962504, 461130952671387592,5157535231753964268] |