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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 101 |
| 5 | 626 |
| 6 | 10001 |
| 7 | 1000001 |
| 8 | 1040401 |
| 9 | 2217122 |
| 10 | 5053505 |
| 11 | 100000001 |
| 12 | 101808101 |
| 13 | 10000000001 |
| 14 | 10182828101 |
| 15 | 10408080401 |
| 16 | 28053235082 |
| 17 | 1000000000001 |
| 18 | 1000400040001 |
| 19 | 1018262628101 |
| 20 | 7534662664357 |
| 21 | 100000000000001 |
| 22 | 100018000810001 |
| 23 | 101826464628101 |