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 | 2 |
| 6 | 4 |
| 7 | 4 |
| 8 | 6 |
| 9 | 9 |
| 10 | 9 |
| 11 | 12 |
| 12 | 16 |
| 13 | 16 |
| 14 | 20 |
| 15 | 25 |
| 16 | 25 |
| 17 | 30 |
| 18 | 36 |
| 19 | 36 |
| 20 | 42 |
| 21 | 49 |
| 22 | 49 |
| 23 | 56 |
| 24 | 64 |
| 25 | 64 |
| 26 | 72 |
| 27 | 81 |
| 28 | 81 |
| 29 | 90 |
| 30 | 100 |
| 31 | 100 |
| 32 | 110 |
| 33 | 121 |
| 34 | 121 |
| 35 | 132 |
| 36 | 144 |
| 37 | 144 |
| 38 | 156 |
| 39 | 169 |
| 40 | 169 |
| 41 | 182 |
| 42 | 196 |
| 43 | 196 |
| 44 | 210 |
| 45 | 225 |
| 46 | 225 |
| 47 | 240 |
| 48 | 256 |
| 49 | 256 |
| 50 | 272 |
| 51 | 289 |
| 52 | 289 |
| 53 | 306 |
| 54 | 324 |
| 55 | 324 |
| 56 | 342 |
| 57 | 361 |
| 58 | 361 |
| 59 | 380 |
| 60 | 400 |
| 61 | 400 |
| 62 | 420 |
| 63 | 441 |
| 64 | 441 |
| 65 | 462 |
| 66 | 484 |
| 67 | 484 |
| 68 | 506 |
[0,0,0,1,1,2,4,4,6,9,9,12,16,16,20,25,25,30,36,36, 42,49,49,56,64,64,72,81,81,90,100,100,110,121,121, 132,144,144,156,169,169,182,196,196,210,225,225, 240,256,256,272,289,289,306,324,324,342,361,361, 380,400,400,420,441,441,462,484,484,506] |