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) |
|---|---|
| 3 | 3 |
| 4 | 29 |
| 5 | 164 |
| 6 | 726 |
| 7 | 2805 |
| 8 | 9975 |
| 9 | 33630 |
| 10 | 109424 |
| 11 | 347519 |
| 12 | 1085313 |
| 13 | 3349848 |
| 14 | 10253994 |
| 15 | 31203945 |
| 16 | 94561643 |
| 17 | 285716018 |
| 18 | 861472836 |
| 19 | 2593592883 |
| 20 | 7800176565 |
| 21 | 23441423340 |
| 22 | 70410252350 |
| 23 | 211411111133 |
| 24 | 634610819679 |
| 25 | 1904620987014 |