The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 30 |
| 5 | 104 |
| 6 | 413 |
| 7 | 1627 |
| 8 | 6738 |
| 9 | 28291 |
| 10 | 121351 |
| 11 | 527845 |
| 12 | 2325348 |
| 13 | 10350338 |
| 14 | 46493978 |
| 15 | 210439523 |
| 16 | 959042601 |
| 17 | 4396353397 |
| 18 | 20259252722 |
| 19 | 93795603600 |
| 20 | 436053315743 |
| 21 | 2034850056215 |
| 22 | 9527769028756 |
| 23 | 44749410126415 |
| 24 | 210766594872031 |
| 25 | 995244645976326 |
| 26 | 4710672278535226 |
| 27 | 22344931695751350 |
[1,1,3,8,30,104,413,1627,6738,28291,121351,527845, 2325348,10350338,46493978,210439523,959042601, 4396353397,20259252722,93795603600,436053315743, 2034850056215,9527769028756,44749410126415, 210766594872031,995244645976326,4710672278535226, 22344931695751350] |