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 | 0 |
| 1 | 0 |
| 2 | 8 |
| 3 | 251 |
| 4 | 2555 |
| 5 | 15055 |
| 6 | 63655 |
| 7 | 214918 |
| 8 | 616326 |
| 9 | 1561110 |
| 10 | 3586110 |
| 11 | 7612385 |
| 12 | 15139553 |
| 13 | 28506101 |
| 14 | 51229165 |
| 15 | 88438540 |
| 16 | 147420940 |
| 17 | 238291788 |
| 18 | 374813076 |
| 19 | 575377095 |
| 20 | 864177095 |
| 21 | 1272587195 |
| 22 | 1840775123 |
| 23 | 2619572626 |
| 24 | 3672629650 |
| 25 | 5078879650 |
| 26 | 6935344650 |
| 27 | 9360309933 |