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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 2 |
| 7 | 1 |
| 8 | 1 |
| 9 | 3 |
| 10 | 5 |
| 11 | 5 |
| 12 | 3 |
| 13 | 1 |
| 14 | 1 |
| 15 | 5 |
| 16 | 15 |
| 17 | 30 |
| 18 | 42 |
| 19 | 42 |
| 20 | 30 |
| 21 | 15 |
| 22 | 5 |
| 23 | 1 |
| 24 | 1 |
| 25 | 6 |
| 26 | 22 |
| 27 | 55 |
| 28 | 99 |
| 29 | 132 |
| 30 | 132 |
| 31 | 99 |
| 32 | 55 |
| 33 | 22 |
| 34 | 6 |
| 35 | 1 |
| 36 | 1 |
| 37 | 8 |
| 38 | 40 |
| 39 | 140 |
| 40 | 364 |
| 41 | 728 |
| 42 | 1144 |
| 43 | 1430 |
| 44 | 1430 |
| 45 | 1144 |
| 46 | 728 |
| 47 | 364 |
| 48 | 140 |
| 49 | 40 |
| 50 | 8 |
| 51 | 1 |
| 52 | 1 |
| 53 | 9 |
| 54 | 51 |
| 55 | 204 |
| 56 | 612 |
| 57 | 1428 |
| 58 | 2652 |
| 59 | 3978 |
| 60 | 4862 |
| 61 | 4862 |
| 62 | 3978 |
| 63 | 2652 |
| 64 | 1428 |
| 65 | 612 |
| 66 | 204 |
| 67 | 51 |
| 68 | 9 |
| 69 | 1 |
[1,1,1,1,2,2,1,1,3,5,5,3,1,1,5,15,30,42,42,30,15, 5,1,1,6,22,55,99,132,132,99,55,22,6,1,1,8,40,140, 364,728,1144,1430,1430,1144,728,364,140,40,8,1,1, 9,51,204,612,1428,2652,3978,4862,4862,3978,2652, 1428,612,204,51,9,1] |