The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 9 |
| 5 | 214 |
| 6 | 223 |
| 7 | 883 |
| 8 | 1106 |
| 9 | 1989 |
| 10 | 96578 |
| 11 | 98567 |
| 12 | 195145 |
| 13 | 684002 |
| 14 | 879147 |
| 15 | 20904383 |
| 16 | 21783530 |
| 17 | 86254973 |
| 18 | 108038503 |
| 19 | 194293476 |
| 20 | 9434125351 |
| 21 | 9628418827 |
| 22 | 19062544178 |
| 23 | 66816051361 |
| 24 | 85878595539 |
| 25 | 2042023748758 |
| 26 | 2127902344297 |
| 27 | 8425730781649 |
| 28 | 10553633125946 |
[1,1,2,7,9,214,223,883,1106,1989,96578,98567, 195145,684002,879147,20904383,21783530,86254973, 108038503,194293476,9434125351,9628418827, 19062544178,66816051361,85878595539,2042023748758, 2127902344297,8425730781649,10553633125946] |