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 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 57 |
| 5 | 222 |
| 6 | 928 |
| 7 | 3764 |
| 8 | 15971 |
| 9 | 66190 |
| 10 | 283464 |
| 11 | 1190628 |
| 12 | 5131002 |
| 13 | 21749532 |
| 14 | 94153056 |
| 15 | 401757672 |
| 16 | 1745117091 |
| 17 | 7484144598 |
| 18 | 32595240952 |
| 19 | 140342565620 |
| 20 | 612526487822 |
| 21 | 2645723309284 |
| 22 | 11567425911936 |
| 23 | 50095161350616 |
| 24 | 219340900447118 |