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 | 3 |
| 1 | 10 |
| 2 | 46 |
| 3 | 244 |
| 4 | 1378 |
| 5 | 8020 |
| 6 | 47386 |
| 7 | 282124 |
| 8 | 1686178 |
| 9 | 10097380 |
| 10 | 60525226 |
| 11 | 362974204 |
| 12 | 2177313778 |
| 13 | 13062288340 |
| 14 | 78368947066 |
| 15 | 470199333484 |
| 16 | 2821152954178 |
| 17 | 16926788584900 |
| 18 | 101560344088906 |
| 19 | 609360902271964 |