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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 5 |
| 7 | 6 |
| 8 | 7 |
| 9 | 8 |
| 10 | 71 |
| 11 | 430 |
| 12 | 1749 |
| 13 | 5708 |
| 14 | 16003 |
| 15 | 40026 |
| 16 | 91505 |
| 17 | 194464 |
| 18 | 3111409 |
| 19 | 32514338 |
| 20 | 220345299 |
| 21 | 1161515620 |
| 22 | 5117035637 |
| 23 | 19624019910 |
| 24 | 67294308247 |
| 25 | 210311057024 |
| 26 | 4860499987799 |
| 27 | 72178664783758 |
| 28 | 684803123126277 |
| 29 | 4985006104393196 |
| 30 | 29947298627248915 |