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) |
|---|---|
| 4 | 3 |
| 5 | 23 |
| 6 | 152 |
| 7 | 984 |
| 8 | 6460 |
| 9 | 43626 |
| 10 | 304939 |
| 11 | 2211467 |
| 12 | 16649780 |
| 13 | 130097338 |
| 14 | 1054226016 |
| 15 | 8850736900 |
| 16 | 76901730751 |
| 17 | 690749091147 |
| 18 | 6406953787268 |
| 19 | 61300205459232 |
| 20 | 604367205789092 |
| 21 | 6133919028981542 |
| 22 | 64027105979768111 |
| 23 | 686736004045762143 |
| 24 | 7562191796264603160 |