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 | 132 |
| 1 | 297 |
| 2 | 869 |
| 3 | 2739 |
| 4 | 8986 |
| 5 | 30275 |
| 6 | 104006 |
| 7 | 362738 |
| 8 | 1280592 |
| 9 | 4566642 |
| 10 | 16423581 |
| 11 | 59497075 |
| 12 | 216901454 |
| 13 | 795117015 |
| 14 | 2929034130 |
| 15 | 10837075830 |
| 16 | 40253156520 |
| 17 | 150045410430 |
| 18 | 561097823490 |
| 19 | 2104382963214 |
| 20 | 7913603390196 |