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 | 7 |
| 2 | 36 |
| 3 | 151 |
| 4 | 570 |
| 5 | 2019 |
| 6 | 6893 |
| 7 | 23034 |
| 8 | 76020 |
| 9 | 249077 |
| 10 | 812614 |
| 11 | 2644447 |
| 12 | 8592693 |
| 13 | 27895296 |
| 14 | 90510106 |
| 15 | 293576779 |
| 16 | 952053411 |
| 17 | 3087093728 |
| 18 | 10009389358 |
| 19 | 32452403488 |
| 20 | 105214363653 |
| 21 | 341111617862 |
| 22 | 1105895184121 |
| 23 | 3585328906357 |
| 24 | 11623651559099 |