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 | 7 |
| 2 | 37 |
| 3 | 217 |
| 4 | 1297 |
| 5 | 7777 |
| 6 | 46657 |
| 7 | 279937 |
| 8 | 1679617 |
| 9 | 10077697 |
| 10 | 60466177 |
| 11 | 362797057 |
| 12 | 2176782337 |
| 13 | 13060694017 |
| 14 | 78364164097 |
| 15 | 470184984577 |
| 16 | 2821109907457 |
| 17 | 16926659444737 |
| 18 | 101559956668417 |
| 19 | 609359740010497 |
| 20 | 3656158440062977 |