The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 20 |
| 1 | 21 |
| 2 | 62 |
| 3 | 83 |
| 4 | 311 |
| 5 | 394 |
| 6 | 2675 |
| 7 | 21794 |
| 8 | 133439 |
| 9 | 155233 |
| 10 | 599138 |
| 11 | 754371 |
| 12 | 2107880 |
| 13 | 2862251 |
| 14 | 116597920 |
| 15 | 119460171 |
| 16 | 355518262 |
| 17 | 474978433 |
| 18 | 1780453561 |
| 19 | 2255431994 |
| 20 | 15313045525 |
| 21 | 124759796194 |
| 22 | 763871822689 |
[20,21,62,83,311,394,2675,21794,133439,155233, 599138,754371,2107880,2862251,116597920,119460171, 355518262,474978433,1780453561,2255431994, 15313045525,124759796194,763871822689] |