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 | 4 |
| 4 | 10 |
| 5 | 20 |
| 6 | 58 |
| 7 | 124 |
| 8 | 344 |
| 9 | 811 |
| 10 | 2071 |
| 11 | 4973 |
| 12 | 15454 |
| 13 | 36031 |
| 14 | 96212 |
| 15 | 237563 |
| 16 | 668695 |
| 17 | 1626751 |
| 18 | 4674373 |
| 19 | 11470722 |
| 20 | 31460456 |
| 21 | 81705943 |
| 22 | 224598113 |