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 | 1 |
| 2 | 8 |
| 3 | 51 |
| 4 | 312 |
| 5 | 1965 |
| 6 | 13248 |
| 7 | 97839 |
| 8 | 800208 |
| 9 | 7260921 |
| 10 | 72806040 |
| 11 | 801515979 |
| 12 | 9620317512 |
| 13 | 125071036389 |
| 14 | 1751016829968 |
| 15 | 26265324194055 |
| 16 | 420245416687392 |
| 17 | 7144172815479921 |
| 18 | 128595113003161512 |
| 19 | 2443307154421058019 |
| 20 | 48866143111666389720 |
| 21 | 1026189005418216656541 |
| 22 | 22576158119430894214368 |