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 | 5 |
| 2 | 15 |
| 3 | 85 |
| 4 | 165 |
| 5 | 235 |
| 6 | 1665 |
| 7 | 15085 |
| 8 | 16665 |
| 9 | 166665 |
| 10 | 268835 |
| 11 | 1666665 |
| 12 | 5076665 |
| 13 | 16666665 |
| 14 | 52683515 |
| 15 | 165898335 |
| 16 | 166666665 |
| 17 | 278433515 |
| 18 | 507668915 |
| 19 | 850032485 |
| 20 | 1508559835 |
| 21 | 1666666665 |
| 22 | 15085017485 |
| 23 | 16666666665 |
| 24 | 166666666665 |