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 | 6 |
| 2 | 36 |
| 3 | 92 |
| 4 | 221 |
| 5 | 618 |
| 6 | 1690 |
| 7 | 4861 |
| 8 | 13900 |
| 9 | 40452 |
| 10 | 117717 |
| 11 | 345002 |
| 12 | 1012682 |
| 13 | 2983173 |
| 14 | 8803252 |
| 15 | 26036140 |
| 16 | 77123437 |
| 17 | 228815946 |
| 18 | 679742490 |
| 19 | 2021736365 |
| 20 | 6019369820 |
| 21 | 17938267476 |
| 22 | 53500929061 |
| 23 | 159681492682 |
| 24 | 476893979146 |
| 25 | 1425053001333 |