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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 23 |
| 5 | 102 |
| 6 | 498 |
| 7 | 2607 |
| 8 | 14386 |
| 9 | 82663 |
| 10 | 490228 |
| 11 | 2981407 |
| 12 | 18507513 |
| 13 | 116855873 |
| 14 | 748427848 |
| 15 | 4851982365 |
| 16 | 31784721142 |
| 17 | 210111119681 |
| 18 | 1399977460914 |
| 19 | 9393523464391 |
| 20 | 63420812374620 |
| 21 | 430570197000992 |
| 22 | 2937789342516835 |
| 23 | 20135022976572246 |
| 24 | 138566149670814993 |