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 | 10 |
| 2 | 36 |
| 3 | 110 |
| 4 | 300 |
| 5 | 752 |
| 6 | 1770 |
| 7 | 3956 |
| 8 | 8470 |
| 9 | 17490 |
| 10 | 35002 |
| 11 | 68150 |
| 12 | 129512 |
| 13 | 240840 |
| 14 | 439190 |
| 15 | 786814 |
| 16 | 1386930 |
| 17 | 2408658 |
| 18 | 4126070 |
| 19 | 6978730 |
| 20 | 11664896 |
| 21 | 19283830 |
| 22 | 31551450 |
| 23 | 51124970 |
| 24 | 82088400 |
| 25 | 130673928 |
| 26 | 206327710 |
| 27 | 323275512 |
| 28 | 502810130 |