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 | 3 |
| 2 | 10 |
| 3 | 22 |
| 4 | 67 |
| 5 | 145 |
| 6 | 436 |
| 7 | 940 |
| 8 | 2821 |
| 9 | 6079 |
| 10 | 18238 |
| 11 | 39298 |
| 12 | 117895 |
| 13 | 254029 |
| 14 | 762088 |
| 15 | 1642072 |
| 16 | 4926217 |
| 17 | 10614523 |
| 18 | 31843570 |
| 19 | 68613358 |
| 20 | 205840075 |
| 21 | 443523721 |
| 22 | 1330571164 |
| 23 | 2866982404 |
| 24 | 8600947213 |
| 25 | 18532465591 |
| 26 | 55597396774 |