The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 13 |
| 5 | 37 |
| 6 | 105 |
| 7 | 289 |
| 8 | 801 |
| 9 | 2193 |
| 10 | 6025 |
| 11 | 16473 |
| 12 | 45101 |
| 13 | 123253 |
| 14 | 336997 |
| 15 | 920789 |
| 16 | 2516373 |
| 17 | 6875125 |
| 18 | 18785189 |
| 19 | 51322821 |
| 20 | 140222045 |
| 21 | 383095757 |
| 22 | 1046652077 |
| 23 | 2859512141 |
| 24 | 7812373537 |
| 25 | 21343816457 |
| 26 | 58312503241 |
| 27 | 159312762649 |
| 28 | 435250868777 |
| 29 | 1189127599849 |
[1,1,1,5,13,37,105,289,801,2193,6025,16473,45101, 123253,336997,920789,2516373,6875125,18785189, 51322821,140222045,383095757,1046652077, 2859512141,7812373537,21343816457,58312503241, 159312762649,435250868777,1189127599849] |