The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 7 |
| 3 | 32 |
| 4 | 158 |
| 5 | 933 |
| 6 | 5939 |
| 7 | 41385 |
| 8 | 306070 |
| 9 | 2403792 |
| 10 | 19799468 |
| 11 | 170676213 |
| 12 | 1530176012 |
| 13 | 14235081941 |
| 14 | 136908376331 |
| 15 | 1358591876186 |
| 16 | 13876456179864 |
| 17 | 145643421890800 |
| 18 | 1568070473632644 |
| 19 | 17295212337571836 |
| 20 | 195161233968831068 |
[1,3,7,32,158,933,5939,41385,306070,2403792, 19799468,170676213,1530176012,14235081941, 136908376331,1358591876186,13876456179864, 145643421890800,1568070473632644, 17295212337571836,195161233968831068] |