The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 81 |
| 3 | 121 |
| 4 | 8281 |
| 5 | 11881 |
| 6 | 128881 |
| 7 | 11282881 |
| 8 | 228281881 |
| 9 | 1112822881 |
| 10 | 111128222881 |
| 11 | 11111282222881 |
| 12 | 222128888112121 |
| 13 | 228828882122281 |
| 14 | 812121128112121 |
| 15 | 1111112822222881 |
| 16 | 8181222218111881 |
| 17 | 111111128222222881 |
| 18 | 11111111282222222881 |
| 19 | 1111111112822222222881 |
| 20 | 2118128181211211281281 |
[1,81,121,8281,11881,128881,11282881,228281881, 1112822881,111128222881,11111282222881, 222128888112121,228828882122281,812121128112121, 1111112822222881,8181222218111881, 111111128222222881,11111111282222222881, 1111111112822222222881,2118128181211211281281] |