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 | 4 |
| 2 | 28 |
| 3 | 188 |
| 4 | 1428 |
| 5 | 10708 |
| 6 | 82948 |
| 7 | 644788 |
| 8 | 5067404 |
| 9 | 40016460 |
| 10 | 317727164 |
| 11 | 2532064332 |
| 12 | 20247784124 |
| 13 | 162353831796 |
| 14 | 1304943724900 |
| 15 | 10510168583516 |