The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 153 |
| 3 | 1345 |
| 4 | 1257 |
| 5 | 1204544 |
| 6 | 11698111 |
| 7 | 114516123 |
| 8 | 1126760562 |
| 9 | 11124999996 |
| 10 | 1011123595468 |
| 11 | 109012001333443 |
| 12 | 10833955895979437 |
| 13 | 1076982819760661072 |
| 14 | 107148014373065628394 |
| 15 | 10667115902902368632876 |
[21,153,1345,1257,1204544,11698111,114516123, 1126760562,11124999996,1011123595468, 109012001333443,10833955895979437, 1076982819760661072,107148014373065628394, 10667115902902368632876] |