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 | 21 |
| 4 | 91 |
| 5 | 266 |
| 6 | 994 |
| 7 | 2562 |
| 8 | 7764 |
| 9 | 19482 |
| 10 | 51212 |
| 11 | 116028 |
| 12 | 288541 |
| 13 | 612463 |
| 14 | 1375609 |
| 15 | 2862437 |
| 16 | 6036606 |
| 17 | 11846488 |
| 18 | 24080685 |
| 19 | 45506290 |