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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 441 |
| 3 | 1113 |
| 4 | 11067 |
| 5 | 41013 |
| 6 | 301035 |
| 7 | 1346961 |
| 8 | 8556723 |
| 9 | 42184905 |
| 10 | 249260739 |
| 11 | 1292345649 |
| 12 | 7358809899 |
| 13 | 39164938617 |
| 14 | 218805732243 |
| 15 | 1180444035057 |
| 16 | 6530395532955 |
| 17 | 35479909625769 |
| 18 | 195286010577987 |
| 19 | 1064871399311265 |
[21,441,1113,11067,41013,301035,1346961,8556723, 42184905,249260739,1292345649,7358809899, 39164938617,218805732243,1180444035057, 6530395532955,35479909625769,195286010577987, 1064871399311265] |