The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 31 |
| 4 | 78 |
| 5 | 781 |
| 6 | 1953 |
| 7 | 19531 |
| 8 | 48828 |
| 9 | 488281 |
| 10 | 1220703 |
| 11 | 12207031 |
| 12 | 30517578 |
| 13 | 305175781 |
| 14 | 762939453 |
| 15 | 7629394531 |
| 16 | 19073486328 |
| 17 | 190734863281 |
| 18 | 476837158203 |
| 19 | 4768371582031 |
| 20 | 11920928955078 |
| 21 | 119209289550781 |
| 22 | 298023223876953 |
| 23 | 2980232238769531 |
| 24 | 7450580596923828 |
[0,1,3,31,78,781,1953,19531,48828,488281,1220703, 12207031,30517578,305175781,762939453,7629394531, 19073486328,190734863281,476837158203, 4768371582031,11920928955078,119209289550781, 298023223876953,2980232238769531,7450580596923828] |