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 | 1 |
| 2 | 20 |
| 3 | 155 |
| 4 | 760 |
| 5 | 2814 |
| 6 | 8592 |
| 7 | 22770 |
| 8 | 54120 |
| 9 | 117975 |
| 10 | 239668 |
| 11 | 459173 |
| 12 | 837200 |
| 13 | 1463020 |
| 14 | 2464320 |
| 15 | 4019412 |
| 16 | 6372144 |
| 17 | 9849885 |
| 18 | 14884980 |
| 19 | 22040095 |
| 20 | 32037896 |
| 21 | 45795530 |
| 22 | 64464400 |
| 23 | 89475750 |
| 24 | 122592600 |
| 25 | 165968595 |
| 26 | 222214356 |
| 27 | 294471945 |
| 28 | 386498080 |