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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 15 |
| 5 | 54 |
| 6 | 223 |
| 7 | 1045 |
| 8 | 5474 |
| 9 | 31685 |
| 10 | 200895 |
| 11 | 1384470 |
| 12 | 10304431 |
| 13 | 82376101 |
| 14 | 703949762 |
| 15 | 6403761365 |
| 16 | 61784985615 |
| 17 | 630180031734 |
| 18 | 6775001385343 |
| 19 | 76572619018165 |
| 20 | 907658144193314 |
| 21 | 11259399965148005 |
| 22 | 145879271404693215 |
| 23 | 1970471655222795990 |
| 24 | 27702625497930064591 |
[1,1,2,5,15,54,223,1045,5474,31685,200895,1384470, 10304431,82376101,703949762,6403761365, 61784985615,630180031734,6775001385343, 76572619018165,907658144193314,11259399965148005, 145879271404693215,1970471655222795990, 27702625497930064591] |