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 | 128 |
| 2 | 16384 |
| 3 | 371641 |
| 4 | 2343189 |
| 5 | 8052573 |
| 6 | 21347949 |
| 7 | 51831694 |
| 8 | 124050234 |
| 9 | 299298122 |
| 10 | 726344042 |
| 11 | 1747724083 |
| 12 | 4106362589 |
| 13 | 9335920794 |
| 14 | 20497890026 |
| 15 | 43553671579 |
| 16 | 89873040155 |
| 17 | 180673406871 |
| 18 | 354644672067 |
| 19 | 680755779412 |
| 20 | 1279369459830 |