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) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 31 |
| 4 | 120 |
| 5 | 418 |
| 6 | 1268 |
| 7 | 3499 |
| 8 | 8987 |
| 9 | 22316 |
| 10 | 51677 |
| 11 | 116978 |
| 12 | 252856 |
| 13 | 528275 |
| 14 | 1075319 |
| 15 | 2131671 |
| 16 | 4119410 |
| 17 | 7801334 |
| 18 | 14482059 |