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 | 13 |
| 2 | 22 |
| 3 | 74 |
| 4 | 219 |
| 5 | 749 |
| 6 | 2544 |
| 7 | 8705 |
| 8 | 29750 |
| 9 | 101869 |
| 10 | 348726 |
| 11 | 1194018 |
| 12 | 4088095 |
| 13 | 13997248 |
| 14 | 47925030 |
| 15 | 164090446 |
| 16 | 561828851 |
| 17 | 1923644742 |
| 18 | 6586363735 |
| 19 | 22551038555 |
| 20 | 77212460575 |
| 21 | 264367602921 |
| 22 | 905167759481 |
| 23 | 3099202251216 |
| 24 | 10611352989541 |