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 | 8 |
| 4 | 56 |
| 5 | 438 |
| 6 | 3574 |
| 7 | 29738 |
| 8 | 249200 |
| 9 | 2094902 |
| 10 | 17648718 |
| 11 | 148968822 |
| 12 | 1259807224 |
| 13 | 10674450652 |
| 14 | 90618393250 |
| 15 | 770728674864 |
| 16 | 6567151658496 |
| 17 | 56054864624310 |
| 18 | 479267092351534 |
| 19 | 4104271159315190 |
| 20 | 35200977081482376 |
| 21 | 302343415930398696 |
| 22 | 2600408469332918538 |
| 23 | 22394817457275426524 |