The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 13588 |
| 5 | 48238 |
| 6 | 54490 |
| 7 | 69004 |
| 8 | 194460 |
| 9 | 353228 |
| 10 | 577980 |
| 11 | 638652 |
| 12 | 1478962 |
| 13 | 1882188 |
| 14 | 2190515 |
| 15 | 2677740 |
| 16 | 3404598 |
| 17 | 3875508 |
| 18 | 8456460 |
| 19 | 9978863 |
| 20 | 16320458 |
| 21 | 41199780 |
| 22 | 45112860 |
| 23 | 76132715 |
| 24 | 236405988 |
| 25 | 357846865 |
| 26 | 682983756 |
| 27 | 689274612 |
| 28 | 733141332 |
| 29 | 1185444052 |
| 30 | 1752193128 |
[1,2,6,13588,48238,54490,69004,194460,353228, 577980,638652,1478962,1882188,2190515,2677740, 3404598,3875508,8456460,9978863,16320458,41199780, 45112860,76132715,236405988,357846865,682983756, 689274612,733141332,1185444052,1752193128] |