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 | 2 |
| 2 | 5 |
| 3 | 11 |
| 4 | 101 |
| 5 | 181 |
| 6 | 18181 |
| 7 | 1008001 |
| 8 | 1022201 |
| 9 | 1055501 |
| 10 | 1082801 |
| 11 | 1085801 |
| 12 | 1180811 |
| 13 | 1208021 |
| 14 | 1221221 |
| 15 | 1250521 |
| 16 | 1280821 |
| 17 | 1508051 |
| 18 | 1520251 |
| 19 | 1551551 |
| 20 | 1580851 |
| 21 | 1802081 |
| 22 | 1805081 |
| 23 | 1880881 |
| 24 | 1881881 |
| 25 | 100111001 |
| 26 | 100888001 |
| 27 | 108101801 |