The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 25 |
| 4 | 101 |
| 5 | 655 |
| 6 | 11077 |
| 7 | 94199 |
| 8 | 2005319 |
| 9 | 62541113 |
| 10 | 530615357 |
| 11 | 3888615949 |
| 12 | 2547768661 |
| 13 | 1603125774433 |
| 14 | 510235838011 |
| 15 | 76538488318091 |
| 16 | 10462945272539099 |
| 17 | 182249306891497151 |
| 18 | 7488308007918913129 |
| 19 | 6810487755999748187 |
[1,4,25,101,655,11077,94199,2005319,62541113, 530615357,3888615949,2547768661,1603125774433, 510235838011,76538488318091,10462945272539099, 182249306891497151,7488308007918913129, 6810487755999748187] |