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 | 20 |
| 1 | 140 |
| 2 | 560 |
| 3 | 1680 |
| 4 | 4200 |
| 5 | 9240 |
| 6 | 18480 |
| 7 | 34320 |
| 8 | 60060 |
| 9 | 100100 |
| 10 | 160160 |
| 11 | 247520 |
| 12 | 371280 |
| 13 | 542640 |
| 14 | 775200 |
| 15 | 1085280 |
| 16 | 1492260 |
| 17 | 2018940 |
| 18 | 2691920 |
| 19 | 3542000 |
| 20 | 4604600 |
| 21 | 5920200 |
| 22 | 7534800 |
| 23 | 9500400 |
| 24 | 11875500 |
| 25 | 14725620 |
| 26 | 18123840 |
| 27 | 22151360 |
| 28 | 26898080 |
| 29 | 32463200 |
| 30 | 38955840 |
| 31 | 46495680 |