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 | 3 |
| 7 | 4 |
| 8 | 3 |
| 9 | 2 |
| 10 | 6 |
| 11 | 10 |
| 12 | 13 |
| 13 | 15 |
| 14 | 13 |
| 15 | 10 |
| 16 | 6 |
| 17 | 24 |
| 18 | 42 |
| 19 | 56 |
| 20 | 67 |
| 21 | 76 |
| 22 | 67 |
| 23 | 56 |
| 24 | 42 |
| 25 | 24 |
| 26 | 120 |
| 27 | 216 |
| 28 | 294 |
| 29 | 358 |
| 30 | 411 |
| 31 | 455 |
| 32 | 411 |
| 33 | 358 |
| 34 | 294 |
| 35 | 216 |
| 36 | 120 |
| 37 | 720 |
| 38 | 1320 |
| 39 | 1824 |
| 40 | 2250 |
| 41 | 2612 |
| 42 | 2921 |
| 43 | 3186 |
| 44 | 2921 |
| 45 | 2612 |
| 46 | 2250 |
| 47 | 1824 |
| 48 | 1320 |
| 49 | 720 |
| 50 | 5040 |
| 51 | 9360 |
| 52 | 13080 |
| 53 | 16296 |
| 54 | 19086 |
| 55 | 21514 |
| 56 | 23633 |
| 57 | 25487 |
| 58 | 23633 |
| 59 | 21514 |
| 60 | 19086 |
| 61 | 16296 |
| 62 | 13080 |
| 63 | 9360 |
| 64 | 5040 |
[1,1,1,1,2,3,4,3,2,6,10,13,15,13,10,6,24,42,56,67, 76,67,56,42,24,120,216,294,358,411,455,411,358, 294,216,120,720,1320,1824,2250,2612,2921,3186, 2921,2612,2250,1824,1320,720,5040,9360,13080, 16296,19086,21514,23633,25487,23633,21514,19086, 16296,13080,9360,5040] |