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 | 11 |
| 5 | 26 |
| 6 | 56 |
| 7 | 127 |
| 8 | 288 |
| 9 | 660 |
| 10 | 1500 |
| 11 | 3401 |
| 12 | 7729 |
| 13 | 17565 |
| 14 | 39930 |
| 15 | 90735 |
| 16 | 206176 |
| 17 | 468536 |
| 18 | 1064750 |
| 19 | 2419661 |
| 20 | 5498621 |
| 21 | 12495505 |
| 22 | 28395889 |
| 23 | 64529315 |
| 24 | 146642077 |
| 25 | 333242093 |
| 26 | 757288191 |
| 27 | 1720927502 |
| 28 | 3910785158 |
| 29 | 8887207808 |
| 30 | 20196062308 |