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 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 37 |
| 4 | 485 |
| 5 | 5933 |
| 6 | 68963 |
| 7 | 774078 |
| 8 | 8493366 |
| 9 | 91683887 |
| 10 | 977694273 |
| 11 | 10327249593 |
| 12 | 108264085934 |
| 13 | 1128049914377 |
| 14 | 11694704489580 |
| 15 | 120734708167792 |
| 16 | 1242063105505230 |
| 17 | 12739510126065301 |
| 18 | 130330025583399801 |