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 | 180 |
| 2 | 6440 |
| 3 | 94620 |
| 4 | 802640 |
| 5 | 4687108 |
| 6 | 20924280 |
| 7 | 76392940 |
| 8 | 238753440 |
| 9 | 659632980 |
| 10 | 1649142216 |
| 11 | 3796582460 |
| 12 | 8156356080 |
| 13 | 16522765220 |
| 14 | 31822575640 |
| 15 | 58659933324 |
| 16 | 104054451520 |
| 17 | 178420035060 |
| 18 | 296839277160 |
| 19 | 480696051420 |
| 20 | 759737228432 |
| 21 | 1174643272260 |
| 22 | 1780196817080 |