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 | 17 |
| 3 | 75 |
| 4 | 321 |
| 5 | 1363 |
| 6 | 5777 |
| 7 | 24475 |
| 8 | 103681 |
| 9 | 439203 |
| 10 | 1860497 |
| 11 | 7881195 |
| 12 | 33385281 |
| 13 | 141422323 |
| 14 | 599074577 |
| 15 | 2537720635 |
| 16 | 10749957121 |
| 17 | 45537549123 |
| 18 | 192900153617 |
| 19 | 817138163595 |
| 20 | 3461452808001 |
| 21 | 14662949395603 |
| 22 | 62113250390417 |
| 23 | 263115950957275 |
| 24 | 1114577054219521 |