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 | 76 |
| 5 | 3773 |
| 6 | 66201 |
| 7 | 651193 |
| 8 | 4318451 |
| 9 | 21754341 |
| 10 | 89267490 |
| 11 | 312974387 |
| 12 | 968069337 |
| 13 | 2704548145 |
| 14 | 6942663519 |
| 15 | 16594368633 |
| 16 | 37311795887 |
| 17 | 79570707969 |
| 18 | 162013125016 |
| 19 | 316669793867 |
| 20 | 596873304925 |
| 21 | 1089009784181 |
| 22 | 1929545889877 |
| 23 | 3329316638249 |
| 24 | 5607471933963 |
| 25 | 9238336533613 |