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 | 10 |
| 2 | 100 |
| 3 | 358 |
| 4 | 1309 |
| 5 | 4181 |
| 6 | 13759 |
| 7 | 46800 |
| 8 | 156135 |
| 9 | 518564 |
| 10 | 1734968 |
| 11 | 5800213 |
| 12 | 19351425 |
| 13 | 64616191 |
| 14 | 215842982 |
| 15 | 720736677 |
| 16 | 2406625466 |
| 17 | 8036934640 |
| 18 | 26838643787 |
| 19 | 89622848751 |
| 20 | 299284174725 |
| 21 | 999425753876 |
| 22 | 3337450100119 |
| 23 | 11144976639396 |