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 | 3 |
| 3 | 11 |
| 4 | 46 |
| 5 | 207 |
| 6 | 979 |
| 7 | 4797 |
| 8 | 24138 |
| 9 | 123998 |
| 10 | 647615 |
| 11 | 3428493 |
| 12 | 18356714 |
| 13 | 99229015 |
| 14 | 540807165 |
| 15 | 2968468275 |
| 16 | 16395456762 |
| 17 | 91053897066 |
| 18 | 508151297602 |
| 19 | 2848290555562 |
| 20 | 16028132445156 |
| 21 | 90516256568235 |
| 22 | 512831902620465 |
| 23 | 2914112388802779 |
| 24 | 16604034506299314 |