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) |
|---|---|
| 1 | 2 |
| 2 | 2 |
| 3 | 6 |
| 4 | 10 |
| 5 | 30 |
| 6 | 66 |
| 7 | 182 |
| 8 | 442 |
| 9 | 1166 |
| 10 | 2930 |
| 11 | 7590 |
| 12 | 19306 |
| 13 | 49662 |
| 14 | 126882 |
| 15 | 325526 |
| 16 | 833050 |
| 17 | 2135150 |
| 18 | 5467346 |
| 19 | 14007942 |
| 20 | 35877322 |
| 21 | 91909086 |
| 22 | 235418370 |
| 23 | 603054710 |
| 24 | 1544728186 |
| 25 | 3956947022 |
| 26 | 10135859762 |
| 27 | 25963647846 |
| 28 | 66507086890 |
| 29 | 170361678270 |
[2,2,6,10,30,66,182,442,1166,2930,7590,19306, 49662,126882,325526,833050,2135150,5467346, 14007942,35877322,91909086,235418370,603054710, 1544728186,3956947022,10135859762,25963647846, 66507086890,170361678270] |