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 | 5 |
| 3 | 15 |
| 4 | 23 |
| 5 | 77 |
| 6 | 173 |
| 7 | 235 |
| 8 | 315 |
| 9 | 1515 |
| 10 | 2435 |
| 11 | 7227 |
| 12 | 23515 |
| 13 | 54335 |
| 14 | 97773 |
| 15 | 243515 |
| 16 | 2435077 |
| 17 | 3090673 |
| 18 | 72497765 |
| 19 | 74533585 |
| 20 | 9639636523 |
| 21 | 979793819766485 |
| 22 | 77170285247817565 |
| 23 | 9794365502654705173 |
| 24 | 1598601020441309256565 |
| 25 | 30484348812550551609088485 |
| 26 | 76975943837016723668817565 |