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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 17 |
| 6 | 106 |
| 7 | 590 |
| 8 | 3090 |
| 9 | 21092 |
| 10 | 127889 |
| 11 | 734604 |
| 12 | 6252468 |
| 13 | 32854824 |
| 14 | 279387963 |
| 15 | 1909105118 |
| 16 | 12319099520 |
| 17 | 95059552565 |
| 18 | 740652053314 |
| 19 | 4888570540807 |
| 20 | 40743793439712 |
| 21 | 307640708818550 |
| 22 | 2379664631112651 |
| 23 | 17269477509704034 |
| 24 | 165628134793721883 |