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 | 11 |
| 2 | 101 |
| 3 | 181 |
| 4 | 16661 |
| 5 | 18181 |
| 6 | 19991 |
| 7 | 1008001 |
| 8 | 1160611 |
| 9 | 1180811 |
| 10 | 1190911 |
| 11 | 1688861 |
| 12 | 1880881 |
| 13 | 1881881 |
| 14 | 1988891 |
| 15 | 100111001 |
| 16 | 100888001 |
| 17 | 101616101 |
| 18 | 101919101 |
| 19 | 106111601 |
| 20 | 106191601 |
| 21 | 108101801 |
| 22 | 109111901 |
| 23 | 109161901 |
| 24 | 110111011 |
| 25 | 111010111 |
| 26 | 111181111 |
| 27 | 116010611 |
| 28 | 116696611 |