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 | 2 |
| 2 | 12 |
| 3 | 77 |
| 4 | 520 |
| 5 | 3612 |
| 6 | 25557 |
| 7 | 183192 |
| 8 | 1325808 |
| 9 | 9666635 |
| 10 | 70897112 |
| 11 | 522472392 |
| 12 | 3865669717 |
| 13 | 28697325048 |
| 14 | 213649228560 |
| 15 | 1594540806612 |
| 16 | 11926354293792 |
| 17 | 89372808145692 |
| 18 | 670865679851667 |
| 19 | 5043360211505000 |
| 20 | 37965778448487120 |
| 21 | 286151354441445570 |
| 22 | 2159143860124095120 |
[1,2,12,77,520,3612,25557,183192,1325808,9666635, 70897112,522472392,3865669717,28697325048, 213649228560,1594540806612,11926354293792, 89372808145692,670865679851667,5043360211505000, 37965778448487120,286151354441445570, 2159143860124095120] |