The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 3 |
| 7 | 4 |
| 8 | 5 |
| 9 | 6 |
| 10 | 8 |
| 11 | 11 |
| 12 | 15 |
| 13 | 20 |
| 14 | 27 |
| 15 | 36 |
| 16 | 48 |
| 17 | 64 |
| 18 | 85 |
| 19 | 114 |
| 20 | 153 |
| 21 | 205 |
| 22 | 274 |
| 23 | 365 |
| 24 | 487 |
| 25 | 651 |
| 26 | 871 |
| 27 | 1165 |
| 28 | 1557 |
| 29 | 2080 |
| 30 | 2780 |
| 31 | 3716 |
| 32 | 4967 |
| 33 | 6639 |
| 34 | 8873 |
| 35 | 11860 |
| 36 | 15853 |
| 37 | 21189 |
| 38 | 28320 |
| 39 | 37850 |
| 40 | 50589 |
| 41 | 67618 |
| 42 | 90379 |
| 43 | 120799 |
| 44 | 161456 |
| 45 | 215797 |
| 46 | 288430 |
| 47 | 385512 |
| 48 | 515269 |
| 49 | 688699 |
[1,1,1,1,1,2,3,4,5,6,8,11,15,20,27,36,48,64,85, 114,153,205,274,365,487,651,871,1165,1557,2080, 2780,3716,4967,6639,8873,11860,15853,21189,28320, 37850,50589,67618,90379,120799,161456,215797, 288430,385512,515269,688699] |