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 | 0 |
| 2 | 35 |
| 3 | 322 |
| 4 | 2373 |
| 5 | 16772 |
| 6 | 117607 |
| 7 | 823494 |
| 8 | 5764745 |
| 9 | 40353544 |
| 10 | 282475179 |
| 11 | 1977326666 |
| 12 | 13841287117 |
| 13 | 96889010316 |
| 14 | 678223072751 |
| 15 | 4747561509838 |
| 16 | 33232930569489 |
| 17 | 232630513987088 |
| 18 | 1628413597910323 |
| 19 | 11398895185373010 |
| 20 | 79792266297611861 |
| 21 | 558545864083283860 |
| 22 | 3909821048582987895 |