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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 6 |
| 7 | 12 |
| 8 | 27 |
| 9 | 65 |
| 10 | 175 |
| 11 | 490 |
| 12 | 1473 |
| 13 | 4588 |
| 14 | 14782 |
| 15 | 48678 |
| 16 | 163414 |
| 17 | 555885 |
| 18 | 1913334 |
| 19 | 6646728 |
| 20 | 23278989 |
| 21 | 82100014 |
| 22 | 291361744 |
| 23 | 1039758962 |
| 24 | 3729276257 |
| 25 | 13437206032 |
| 26 | 48620868106 |
| 27 | 176611864312 |
| 28 | 643834562075 |
| 29 | 2354902813742 |
| 30 | 8640039835974 |
| 31 | 31791594259244 |