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 | 4 |
| 3 | 14 |
| 4 | 69 |
| 5 | 372 |
| 6 | 2320 |
| 7 | 15913 |
| 8 | 119938 |
| 9 | 978456 |
| 10 | 8586177 |
| 11 | 80456488 |
| 12 | 800905726 |
| 13 | 8429875989 |
| 14 | 93453556378 |
| 15 | 1087491751050 |
| 16 | 13244265431889 |
| 17 | 168370713583760 |
| 18 | 2229127899764052 |
| 19 | 30671277674880073 |
| 20 | 437770190804865414 |
| 21 | 6470590710038358164 |
| 22 | 98891186448861721537 |
| 23 | 1560548838446810788940 |
| 24 | 25394750159240696915562 |