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 | 0 |
| 2 | 2 |
| 3 | 18 |
| 4 | 60 |
| 5 | 270 |
| 6 | 462 |
| 7 | 1080 |
| 8 | 1530 |
| 9 | 2772 |
| 10 | 5670 |
| 11 | 6960 |
| 12 | 11970 |
| 13 | 16380 |
| 14 | 18942 |
| 15 | 24840 |
| 16 | 35802 |
| 17 | 49590 |
| 18 | 54870 |
| 19 | 72930 |
| 20 | 86940 |
| 21 | 94572 |
| 22 | 120120 |
| 23 | 139482 |
| 24 | 172260 |
| 25 | 223440 |
| 26 | 252450 |
| 27 | 267852 |
| 28 | 300510 |
| 29 | 317790 |
| 30 | 354312 |
| 31 | 504000 |
| 32 | 553410 |
| 33 | 633420 |
| 34 | 661710 |
| 35 | 815850 |