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 | 1 |
| 2 | 41 |
| 3 | 205 |
| 4 | 577 |
| 5 | 3747 |
| 6 | 23066 |
| 7 | 103673 |
| 8 | 514290 |
| 9 | 2834897 |
| 10 | 14505899 |
| 11 | 72679629 |
| 12 | 377711106 |
| 13 | 1958960586 |
| 14 | 10014143622 |
| 15 | 51449828843 |
| 16 | 265527351855 |
| 17 | 1365723938126 |
| 18 | 7018444981802 |
| 19 | 36127198341369 |
| 20 | 185940488937815 |
| 21 | 956389182435753 |