This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 36 |
| 3 | 816 |
| 4 | 9612 |
| 5 | 93744 |
| 6 | 973728 |
| 7 | 9939915 |
| 8 | 99221112 |
| 9 | 997711344 |
| 10 | 9993393711 |
| 11 | 99934212672 |
| 12 | 999641938176 |
| 13 | 9999121936392 |
| 14 | 99996414731136 |
| 15 | 999994123418112 |
| 16 | 9999982411646976 |
| 17 | 99999318116613312 |
| 18 | 999991631331122112 |
| 19 | 9999944111773994112 |
| 20 | 99999911232931433472 |
| 21 | 999999832211912282112 |