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 | 90 |
| 1 | 1260 |
| 2 | 13230 |
| 3 | 126720 |
| 4 | 1171170 |
| 5 | 10663380 |
| 6 | 96461910 |
| 7 | 870123240 |
| 8 | 7838973450 |
| 9 | 70582218300 |
| 10 | 635365793790 |
| 11 | 5718795460560 |
| 12 | 51471172410930 |
| 13 | 463248604762020 |
| 14 | 4169269655112870 |
| 15 | 37523555745034680 |
| 16 | 337712517101387610 |
| 17 | 3039414715496790540 |
| 18 | 27354740685808323150 |
| 19 | 246192699157623741600 |
| 20 | 2215734424360009007490 |