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) |
|---|---|
| 0 | 3 |
| 1 | 0 |
| 2 | 21 |
| 3 | 3 |
| 4 | 201 |
| 5 | 13 |
| 6 | 18081 |
| 7 | 43 |
| 8 | 140049 |
| 9 | 81 |
| 10 | 600009 |
| 11 | 147 |
| 12 | 6000009 |
| 13 | 73 |
| 14 | 380000361 |
| 15 | 3 |
| 16 | 1400000049 |
| 17 | 831 |
| 18 | 14000000049 |
| 19 | 49 |
| 20 | 380000000361 |
| 21 | 987 |
| 22 | 600000000009 |
| 23 | 691 |
| 24 | 78000000001521 |
| 25 | 183 |
| 26 | 740000000001369 |
| 27 | 4153 |
| 28 | 6200000000000961 |
| 29 | 279 |