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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 2 |
| 5 | 1 |
| 6 | 3 |
| 7 | 2 |
| 8 | 5 |
| 9 | 3 |
| 10 | 7 |
| 11 | 5 |
| 12 | 9 |
| 13 | 7 |
| 14 | 12 |
| 15 | 9 |
| 16 | 15 |
| 17 | 12 |
| 18 | 18 |
| 19 | 15 |
| 20 | 22 |
| 21 | 18 |
| 22 | 26 |
| 23 | 22 |
| 24 | 30 |
| 25 | 26 |
| 26 | 35 |
| 27 | 30 |
| 28 | 40 |
| 29 | 35 |
| 30 | 45 |
| 31 | 40 |
| 32 | 51 |
| 33 | 45 |
| 34 | 57 |
| 35 | 51 |
| 36 | 63 |
| 37 | 57 |
| 38 | 70 |
| 39 | 63 |
| 40 | 77 |
| 41 | 70 |
| 42 | 84 |
| 43 | 77 |
| 44 | 92 |
| 45 | 84 |
| 46 | 100 |
| 47 | 92 |
| 48 | 108 |
| 49 | 100 |
| 50 | 117 |
| 51 | 108 |
| 52 | 126 |
| 53 | 117 |
| 54 | 135 |
| 55 | 126 |
| 56 | 145 |
| 57 | 135 |
| 58 | 155 |
| 59 | 145 |
| 60 | 165 |
| 61 | 155 |
| 62 | 176 |
| 63 | 165 |
| 64 | 187 |
| 65 | 176 |
| 66 | 198 |
| 67 | 187 |
[0,1,0,2,1,3,2,5,3,7,5,9,7,12,9,15,12,18,15,22,18, 26,22,30,26,35,30,40,35,45,40,51,45,57,51,63,57, 70,63,77,70,84,77,92,84,100,92,108,100,117,108, 126,117,135,126,145,135,155,145,165,155,176,165, 187,176,198,187] |