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 | 7 |
| 2 | 79 |
| 3 | 130783 |
| 4 | 523927 |
| 5 | 9007199254738183 |
| 6 | 9671406556917033397642519 |
| 7 | 215679573337205118357336120696157045389097155380324579848828881942199 |