The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 3 |
| 5 | 6 |
| 6 | 10 |
| 7 | 15 |
| 8 | 21 |
| 9 | 37 |
| 10 | 56 |
| 11 | 80 |
| 12 | 127 |
| 13 | 183 |
| 14 | 280 |
| 15 | 428 |
| 16 | 616 |
| 17 | 893 |
| 18 | 1367 |
| 19 | 1944 |
| 20 | 2846 |
| 21 | 4223 |
| 22 | 6049 |
| 23 | 8691 |
| 24 | 12670 |
| 25 | 18128 |
| 26 | 25921 |
| 27 | 37529 |
| 28 | 53338 |
| 29 | 75738 |
| 30 | 108561 |
| 31 | 153460 |
| 32 | 216762 |
| 33 | 308829 |
| 34 | 433893 |
| 35 | 612006 |
| 36 | 864990 |
| 37 | 1211097 |
| 38 | 1697020 |
| 39 | 2386016 |
| 40 | 3331037 |
| 41 | 4648229 |
| 42 | 6503314 |
[1,1,1,3,3,6,10,15,21,37,56,80,127,183,280,428, 616,893,1367,1944,2846,4223,6049,8691,12670,18128, 25921,37529,53338,75738,108561,153460,216762, 308829,433893,612006,864990,1211097,1697020, 2386016,3331037,4648229,6503314] |