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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 5 |
| 7 | 4 |
| 8 | 3 |
| 9 | 2 |
| 10 | 20 |
| 11 | 15 |
| 12 | 11 |
| 13 | 8 |
| 14 | 6 |
| 15 | 84 |
| 16 | 64 |
| 17 | 49 |
| 18 | 38 |
| 19 | 30 |
| 20 | 24 |
| 21 | 424 |
| 22 | 340 |
| 23 | 276 |
| 24 | 227 |
| 25 | 189 |
| 26 | 159 |
| 27 | 135 |
| 28 | 2680 |
| 29 | 2256 |
| 30 | 1916 |
| 31 | 1640 |
| 32 | 1413 |
| 33 | 1224 |
| 34 | 1065 |
| 35 | 930 |
| 36 | 20544 |
| 37 | 17864 |
| 38 | 15608 |
| 39 | 13692 |
| 40 | 12052 |
| 41 | 10639 |
| 42 | 9415 |
| 43 | 8350 |
| 44 | 7420 |
| 45 | 182336 |
| 46 | 161792 |
| 47 | 143928 |
| 48 | 128320 |
| 49 | 114628 |
| 50 | 102576 |
| 51 | 91937 |
| 52 | 82522 |
| 53 | 74172 |
| 54 | 66752 |
[0,0,0,1,1,1,5,4,3,2,20,15,11,8,6,84,64,49,38,30, 24,424,340,276,227,189,159,135,2680,2256,1916, 1640,1413,1224,1065,930,20544,17864,15608,13692, 12052,10639,9415,8350,7420,182336,161792,143928, 128320,114628,102576,91937,82522,74172,66752] |