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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 10 |
| 4 | 64 |
| 5 | 529 |
| 6 | 4270 |
| 7 | 37078 |
| 8 | 328765 |
| 9 | 2997844 |
| 10 | 27840748 |
| 11 | 262746590 |
| 12 | 2511753957 |
| 13 | 24274552279 |
| 14 | 236771528856 |
| 15 | 2327857190814 |
| 16 | 23045073461778 |
| 17 | 229523320443974 |
| 18 | 2298252776303916 |
| 19 | 23122596000124215 |
| 20 | 233629865440550370 |
| 21 | 2369682121825700424 |
| 22 | 24119295413989862382 |