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 | 5 |
| 2 | 10 |
| 3 | 20 |
| 4 | 60 |
| 5 | 120 |
| 6 | 340 |
| 7 | 620 |
| 8 | 1800 |
| 9 | 3100 |
| 10 | 9240 |
| 11 | 15620 |
| 12 | 46440 |
| 13 | 78120 |
| 14 | 233740 |
| 15 | 390480 |
| 16 | 1170000 |
| 17 | 1953120 |
| 18 | 5855900 |
| 19 | 9765620 |
| 20 | 29287440 |
| 21 | 48827480 |
| 22 | 146468740 |
| 23 | 244140620 |
| 24 | 732373200 |
| 25 | 1220703000 |
| 26 | 3662031240 |