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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 22 |
| 5 | 91 |
| 6 | 409 |
| 7 | 1953 |
| 8 | 9763 |
| 9 | 50583 |
| 10 | 269697 |
| 11 | 1472080 |
| 12 | 8193306 |
| 13 | 46359256 |
| 14 | 266023710 |
| 15 | 1545165168 |
| 16 | 9070274236 |
| 17 | 53739936609 |
| 18 | 321025143482 |
| 19 | 1931764542709 |
| 20 | 11700651842997 |
| 21 | 71288958790413 |
| 22 | 436662467207291 |
| 23 | 2687623420862395 |
| 24 | 16615163817647042 |
| 25 | 103131646740020637 |