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 | 12 |
| 2 | 95 |
| 3 | 630 |
| 4 | 3801 |
| 5 | 21672 |
| 6 | 119154 |
| 7 | 639180 |
| 8 | 3369795 |
| 9 | 17543196 |
| 10 | 90476100 |
| 11 | 463291920 |
| 12 | 2359240975 |
| 13 | 11961944400 |
| 14 | 60440659640 |
| 15 | 304543085040 |
| 16 | 1531044995355 |
| 17 | 7682898791700 |
| 18 | 38494752520175 |
| 19 | 192632866196694 |
| 20 | 962948703201331 |
| 21 | 4809438625979592 |
| 22 | 24002988378037350 |
| 23 | 119719958370912900 |