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 | 7 |
| 3 | 18 |
| 4 | 40 |
| 5 | 104 |
| 6 | 231 |
| 7 | 607 |
| 8 | 1353 |
| 9 | 3575 |
| 10 | 7989 |
| 11 | 21169 |
| 12 | 47384 |
| 13 | 125757 |
| 14 | 281798 |
| 15 | 748638 |
| 16 | 1678832 |
| 17 | 4463098 |
| 18 | 10014074 |
| 19 | 26635050 |
| 20 | 59787092 |
| 21 | 159078450 |
| 22 | 357193976 |
| 23 | 950678416 |
| 24 | 2135189511 |
| 25 | 5684158586 |
| 26 | 12769030254 |
| 27 | 33999245582 |