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) |
|---|---|
| 2 | 25 |
| 3 | 87 |
| 4 | 240 |
| 5 | 774 |
| 6 | 1960 |
| 7 | 5378 |
| 8 | 15828 |
| 9 | 40420 |
| 10 | 110477 |
| 11 | 306255 |
| 12 | 823267 |
| 13 | 2219935 |
| 14 | 6035446 |
| 15 | 16314684 |
| 16 | 44245201 |
| 17 | 119849369 |
| 18 | 324308909 |
| 19 | 879921037 |
| 20 | 2385657333 |
| 21 | 6467079803 |
| 22 | 17541637367 |
| 23 | 47581552613 |
| 24 | 129104928784 |
| 25 | 350330765356 |
| 26 | 950772205549 |
| 27 | 2580621276899 |
| 28 | 7005302330033 |