The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 39 |
| 4 | 182 |
| 5 | 862 |
| 6 | 4162 |
| 7 | 20259 |
| 8 | 99337 |
| 9 | 489304 |
| 10 | 2418609 |
| 11 | 11984697 |
| 12 | 59500280 |
| 13 | 295825856 |
| 14 | 1472439767 |
| 15 | 7335264669 |
| 16 | 36567210877 |
| 17 | 182391230093 |
| 18 | 910133114645 |
| 19 | 4543159341619 |
| 20 | 22684762319963 |
| 21 | 113295004470674 |
| 22 | 565938581524197 |
| 23 | 2827451899485504 |
| 24 | 14127870884837241 |
| 25 | 70599917787569226 |
| 26 | 352833539517667531 |
[1,2,9,39,182,862,4162,20259,99337,489304,2418609, 11984697,59500280,295825856,1472439767,7335264669, 36567210877,182391230093,910133114645, 4543159341619,22684762319963,113295004470674, 565938581524197,2827451899485504, 14127870884837241,70599917787569226, 352833539517667531] |