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 | 1 |
| 1 | 200 |
| 2 | 7760 |
| 3 | 122264 |
| 4 | 1099040 |
| 5 | 6728168 |
| 6 | 31208560 |
| 7 | 117555640 |
| 8 | 376977472 |
| 9 | 1064088840 |
| 10 | 2708805776 |
| 11 | 6332774360 |
| 12 | 13786237280 |
| 13 | 28250329640 |
| 14 | 54959921840 |
| 15 | 102213292024 |
| 16 | 182747113600 |
| 17 | 315568484680 |
| 18 | 528350005968 |
| 19 | 860509231640 |
| 20 | 1367110174112 |
| 21 | 2123741938280 |
| 22 | 3232547993840 |