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 | 1 |
| 4 | 603 |
| 5 | 47290 |
| 6 | 1822014 |
| 7 | 49258935 |
| 8 | 1086859301 |
| 9 | 21147576440 |
| 10 | 379269758400 |
| 11 | 6441229796061 |
| 12 | 105398150289775 |
| 13 | 1680774708581766 |
| 14 | 26324724399068626 |
| 15 | 407112461900381715 |
| 16 | 6239897666881158537 |
| 17 | 95036195852840662820 |
| 18 | 1440959515956284422196 |
| 19 | 21778829725476446172249 |