The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 23 |
| 3 | 236 |
| 4 | 2095 |
| 5 | 18296 |
| 6 | 154562 |
| 7 | 1280878 |
| 8 | 10492879 |
| 9 | 85253117 |
| 10 | 688997802 |
| 11 | 5548695509 |
| 12 | 44580367227 |
| 13 | 357622113010 |
| 14 | 2865892548630 |
| 15 | 22950987106487 |
| 16 | 183716756194773 |
| 17 | 1470171909243331 |
| 18 | 11762592622678971 |
| 19 | 94098427741015878 |
[2,23,236,2095,18296,154562,1280878,10492879, 85253117,688997802,5548695509,44580367227, 357622113010,2865892548630,22950987106487, 183716756194773,1470171909243331, 11762592622678971,94098427741015878] |