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 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 22 |
| 4 | 69 |
| 5 | 218 |
| 6 | 687 |
| 7 | 2166 |
| 8 | 6829 |
| 9 | 21530 |
| 10 | 67879 |
| 11 | 214006 |
| 12 | 674709 |
| 13 | 2127194 |
| 14 | 6706527 |
| 15 | 21144054 |
| 16 | 66662077 |
| 17 | 210169370 |
| 18 | 662613079 |
| 19 | 2089058422 |
| 20 | 6586294821 |
| 21 | 20764991066 |
| 22 | 65466983439 |
| 23 | 206401529718 |
| 24 | 650733991885 |
| 25 | 2051606539802 |
| 26 | 6468218114695 |
| 27 | 20392723832566 |