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 | 0 |
| 2 | 4 |
| 3 | 17 |
| 4 | 62 |
| 5 | 238 |
| 6 | 912 |
| 7 | 3468 |
| 8 | 13224 |
| 9 | 50655 |
| 10 | 194672 |
| 11 | 750165 |
| 12 | 2897898 |
| 13 | 11219322 |
| 14 | 43520672 |
| 15 | 169113746 |
| 16 | 658172740 |
| 17 | 2565143148 |
| 18 | 10010037116 |
| 19 | 39107620002 |
| 20 | 152948221004 |
| 21 | 598750691827 |
| 22 | 2346021879720 |
| 23 | 9199672561659 |
| 24 | 36102743330922 |