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) |
|---|---|
| 4 | 7 |
| 5 | 12 |
| 6 | 23 |
| 7 | 42 |
| 8 | 78 |
| 9 | 142 |
| 10 | 262 |
| 11 | 482 |
| 12 | 887 |
| 13 | 1630 |
| 14 | 2999 |
| 15 | 5516 |
| 16 | 10146 |
| 17 | 18660 |
| 18 | 34322 |
| 19 | 63128 |
| 20 | 116111 |