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 | 2 |
| 1 | 22 |
| 2 | 250 |
| 3 | 3750 |
| 4 | 41250 |
| 5 | 414150 |
| 6 | 4166250 |
| 7 | 42281250 |
| 8 | 438281250 |
| 9 | 4400343750 |
| 10 | 44266406250 |
| 11 | 449238281250 |
| 12 | 4510352343750 |
| 13 | 45373066406250 |
| 14 | 455545586718750 |
| 15 | 4555455867187500 |
| 16 | 45555287544813750 |
| 17 | 455552875448137500 |
| 18 | 4566844506855468750 |
| 19 | 45668445068554687500 |