The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 3 |
| 5 | 3 |
| 6 | 4 |
| 7 | 4 |
| 8 | 4 |
| 9 | 5 |
| 10 | 6 |
| 11 | 5 |
| 12 | 5 |
| 13 | 7 |
| 14 | 6 |
| 15 | 6 |
| 16 | 7 |
| 17 | 7 |
| 18 | 9 |
| 19 | 7 |
| 20 | 7 |
| 21 | 8 |
| 22 | 10 |
| 23 | 8 |
| 24 | 9 |
| 25 | 8 |
| 26 | 8 |
| 27 | 9 |
| 28 | 11 |
| 29 | 10 |
| 30 | 9 |
| 31 | 10 |
| 32 | 13 |
| 33 | 11 |
| 34 | 10 |
| 35 | 13 |
| 36 | 14 |
| 37 | 12 |
| 38 | 11 |
| 39 | 13 |
| 40 | 11 |
| 41 | 11 |
| 42 | 12 |
| 43 | 13 |
| 44 | 12 |
| 45 | 14 |
| 46 | 13 |
| 47 | 16 |
| 48 | 12 |
| 49 | 12 |
| 50 | 17 |
| 51 | 13 |
| 52 | 14 |
| 53 | 13 |
| 54 | 16 |
| 55 | 13 |
| 56 | 18 |
| 57 | 14 |
| 58 | 16 |
| 59 | 15 |
| 60 | 14 |
| 61 | 17 |
| 62 | 14 |
| 63 | 15 |
| 64 | 14 |
| 65 | 14 |
| 66 | 14 |
| 67 | 17 |
| 68 | 16 |
| 69 | 19 |
| 70 | 16 |
| 71 | 17 |
| 72 | 16 |
| 73 | 20 |
[1,2,2,3,3,4,4,4,5,6,5,5,7,6,6,7,7,9,7,7,8,10,8,9, 8,8,9,11,10,9,10,13,11,10,13,14,12,11,13,11,11,12, 13,12,14,13,16,12,12,17,13,14,13,16,13,18,14,16, 15,14,17,14,15,14,14,14,17,16,19,16,17,16,20] |