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 | 15 |
| 3 | 211 |
| 4 | 2955 |
| 5 | 41371 |
| 6 | 579195 |
| 7 | 8108731 |
| 8 | 113522235 |
| 9 | 1589311291 |
| 10 | 22250358075 |
| 11 | 311505013051 |
| 12 | 4361070182715 |
| 13 | 61054982558011 |
| 14 | 854769755812155 |
| 15 | 11966776581370171 |
| 16 | 167534872139182395 |
| 17 | 2345488209948553531 |