The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 46 |
| 4 | 207 |
| 5 | 941 |
| 6 | 4415 |
| 7 | 21045 |
| 8 | 100678 |
| 9 | 486957 |
| 10 | 2370954 |
| 11 | 11563058 |
| 12 | 56680194 |
| 13 | 278759272 |
| 14 | 1372238073 |
| 15 | 6773424153 |
| 16 | 33496331672 |
| 17 | 165743991475 |
| 18 | 821426350054 |
| 19 | 4075614613481 |
| 20 | 20229562090050 |
| 21 | 100510570736767 |
| 22 | 499753226502617 |
| 23 | 2485527626416439 |
| 24 | 12369880809903471 |
| 25 | 61592426685346230 |
| 26 | 306744102770414629 |
[1,3,11,46,207,941,4415,21045,100678,486957, 2370954,11563058,56680194,278759272,1372238073, 6773424153,33496331672,165743991475,821426350054, 4075614613481,20229562090050,100510570736767, 499753226502617,2485527626416439, 12369880809903471,61592426685346230, 306744102770414629] |