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 | 1 |
| 4 | 4 |
| 5 | 6 |
| 6 | 1 |
| 7 | 6 |
| 8 | 15 |
| 9 | 20 |
| 10 | 1 |
| 11 | 8 |
| 12 | 28 |
| 13 | 56 |
| 14 | 70 |
| 15 | 1 |
| 16 | 10 |
| 17 | 45 |
| 18 | 120 |
| 19 | 210 |
| 20 | 252 |
| 21 | 1 |
| 22 | 12 |
| 23 | 66 |
| 24 | 220 |
| 25 | 495 |
| 26 | 792 |
| 27 | 924 |
| 28 | 1 |
| 29 | 14 |
| 30 | 91 |
| 31 | 364 |
| 32 | 1001 |
| 33 | 2002 |
| 34 | 3003 |
| 35 | 3432 |
| 36 | 1 |
| 37 | 16 |
| 38 | 120 |
| 39 | 560 |
| 40 | 1820 |
| 41 | 4368 |
| 42 | 8008 |
| 43 | 11440 |
| 44 | 12870 |
| 45 | 1 |
| 46 | 18 |
| 47 | 153 |
| 48 | 816 |
| 49 | 3060 |
| 50 | 8568 |
| 51 | 18564 |
| 52 | 31824 |
| 53 | 43758 |
| 54 | 48620 |
[1,1,2,1,4,6,1,6,15,20,1,8,28,56,70,1,10,45,120, 210,252,1,12,66,220,495,792,924,1,14,91,364,1001, 2002,3003,3432,1,16,120,560,1820,4368,8008,11440, 12870,1,18,153,816,3060,8568,18564,31824,43758, 48620] |