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 | 3 |
| 2 | 53 |
| 3 | 753 |
| 4 | 11753 |
| 5 | 1311753 |
| 6 | 171311753 |
| 7 | 19171311753 |
| 8 | 2319171311753 |
| 9 | 292319171311753 |
| 10 | 31292319171311753 |
| 11 | 3731292319171311753 |
| 12 | 413731292319171311753 |
| 13 | 43413731292319171311753 |
| 14 | 4743413731292319171311753 |
| 15 | 534743413731292319171311753 |
| 16 | 59534743413731292319171311753 |