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 | 6 |
| 2 | 7 |
| 3 | 20 |
| 4 | 47 |
| 5 | 114 |
| 6 | 161 |
| 7 | 436 |
| 8 | 3213 |
| 9 | 16501 |
| 10 | 19714 |
| 11 | 36215 |
| 12 | 55929 |
| 13 | 148073 |
| 14 | 352075 |
| 15 | 6837498 |
| 16 | 7189573 |
| 17 | 21216644 |
| 18 | 28406217 |
| 19 | 220060163 |
| 20 | 248466380 |
| 21 | 468526543 |
| 22 | 4465205267 |
| 23 | 4933731810 |
| 24 | 19266400697 |
| 25 | 24200132507 |
| 26 | 43466533204 |
| 27 | 111133198915 |