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 | 5 |
| 3 | 22 |
| 4 | 94 |
| 5 | 399 |
| 6 | 1696 |
| 7 | 7243 |
| 8 | 31122 |
| 9 | 134623 |
| 10 | 586324 |
| 11 | 2570936 |
| 12 | 11347408 |
| 13 | 50401287 |
| 14 | 225215350 |
| 15 | 1012114200 |
| 16 | 4572954259 |
| 17 | 20766382311 |
| 18 | 94751225278 |
| 19 | 434246502792 |
| 20 | 1998426293942 |
| 21 | 9232496379669 |
| 22 | 42807004979015 |
| 23 | 199144155148587 |