The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 13 |
| 4 | 511 |
| 5 | 1562 |
| 6 | 3013 |
| 7 | 411771 |
| 8 | 33554431 |
| 9 | 193710244 |
| 10 | 159687996 |
| 11 | 142655835305 |
| 12 | 2545864168851 |
| 13 | 151437553296126 |
| 14 | 4672524492952950 |
| 15 | 190419981278726 |
| 16 | 36893488147419103231 |
| 17 | 413620130943168382088 |
| 18 | 6624115793937660813847 |
| 19 | 989209827830156794561989 |
| 20 | 5961027129129868073483022 |
| 21 | 579547002657587965773234693 |
[1,7,13,511,1562,3013,411771,33554431,193710244, 159687996,142655835305,2545864168851, 151437553296126,4672524492952950,190419981278726, 36893488147419103231,413620130943168382088, 6624115793937660813847,989209827830156794561989, 5961027129129868073483022, 579547002657587965773234693] |