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 | 0 |
| 3 | 2 |
| 4 | 6 |
| 5 | 18 |
| 6 | 9 |
| 7 | 27 |
| 8 | 13 |
| 9 | 39 |
| 10 | 19 |
| 11 | 9 |
| 12 | 4 |
| 13 | 2 |
| 14 | 1 |
| 15 | 0 |
| 16 | 0 |
| 17 | 0 |
| 18 | 0 |
| 19 | 0 |
| 20 | 0 |
| 21 | 3 |
| 22 | 5 |
| 23 | 7 |
| 24 | 8 |
| 25 | 10 |
| 26 | 11 |
| 27 | 5 |
| 28 | 2 |
| 29 | 1 |
| 30 | 3 |
| 31 | 1 |
| 32 | 12 |
| 33 | 6 |
| 34 | 3 |
| 35 | 1 |
| 36 | 3 |
| 37 | 1 |
| 38 | 0 |
| 39 | 0 |
| 40 | 0 |
| 41 | 0 |
| 42 | 0 |
| 43 | 0 |
| 44 | 0 |
| 45 | 0 |
| 46 | 0 |
| 47 | 14 |
| 48 | 15 |
| 49 | 16 |
| 50 | 17 |
| 51 | 20 |
| 52 | 21 |
| 53 | 22 |
| 54 | 23 |
| 55 | 24 |
| 56 | 12 |
| 57 | 36 |
| 58 | 18 |
| 59 | 9 |
| 60 | 4 |
| 61 | 12 |
| 62 | 6 |
| 63 | 3 |
| 64 | 9 |
| 65 | 25 |
| 66 | 75 |
| 67 | 37 |
| 68 | 111 |
| 69 | 333 |
| 70 | 999 |
| 71 | 499 |
| 72 | 1497 |
| 73 | 4491 |
| 74 | 2245 |
| 75 | 6735 |
| 76 | 3367 |
| 77 | 10101 |
| 78 | 5050 |
| 79 | 15150 |
| 80 | 7575 |
[1,0,2,6,18,9,27,13,39,19,9,4,2,1,0,0,0,0,0,0,3,5, 7,8,10,11,5,2,1,3,1,12,6,3,1,3,1,0,0,0,0,0,0,0,0, 0,14,15,16,17,20,21,22,23,24,12,36,18,9,4,12,6,3, 9,25,75,37,111,333,999,499,1497,4491,2245,6735, 3367,10101,5050,15150,7575] |