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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 5 |
| 5 | 98 |
| 6 | 1234 |
| 7 | 13255 |
| 8 | 129567 |
| 9 | 1219243 |
| 10 | 11287965 |
| 11 | 103578486 |
| 12 | 946685407 |
| 13 | 8643973155 |
| 14 | 78973715102 |
| 15 | 722623290887 |
| 16 | 6625617932534 |
| 17 | 60889631777778 |
| 18 | 560938901663498 |