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 | 4 |
| 1 | 16 |
| 2 | 76 |
| 3 | 376 |
| 4 | 1876 |
| 5 | 9376 |
| 6 | 46876 |
| 7 | 234376 |
| 8 | 1171876 |
| 9 | 5859376 |
| 10 | 29296876 |
| 11 | 146484376 |
| 12 | 732421876 |
| 13 | 3662109376 |
| 14 | 18310546876 |
| 15 | 91552734376 |
| 16 | 457763671876 |
| 17 | 2288818359376 |
| 18 | 11444091796876 |
| 19 | 57220458984376 |
| 20 | 286102294921876 |
| 21 | 1430511474609376 |