The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 10 |
| 4 | 18 |
| 5 | 26 |
| 6 | 40 |
| 7 | 46 |
| 8 | 78 |
| 9 | 230 |
| 10 | 542 |
| 11 | 1286 |
| 12 | 1550 |
| 13 | 1728 |
| 14 | 2138 |
| 15 | 2226 |
| 16 | 2686 |
| 17 | 3742 |
| 18 | 5002 |
| 19 | 12730 |
| 20 | 42936 |
| 21 | 64290 |
| 22 | 86602 |
| 23 | 86686 |
| 24 | 109346 |
| 25 | 113966 |
| 26 | 133346 |
| 27 | 211876 |
| 28 | 229850 |
| 29 | 238230 |
| 30 | 294662 |
| 31 | 391322 |
| 32 | 459352 |
[2,6,10,18,26,40,46,78,230,542,1286,1550,1728, 2138,2226,2686,3742,5002,12730,42936,64290,86602, 86686,109346,113966,133346,211876,229850,238230, 294662,391322,459352] |