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 | 0 |
| 5 | 0 |
| 6 | 10 |
| 7 | 840 |
| 8 | 57428 |
| 9 | 4323760 |
| 10 | 428530774 |
| 11 | 66698370662 |
| 12 | 19304350714396 |
| 13 | 11435576322977378 |
| 14 | 13998454986272457974 |
| 15 | 34730539006860778387488 |
| 16 | 172307954877667746584363616 |
| 17 | 1699711619922134215461075979752 |
| 18 | 33269167602899548362529088074829390 |