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 | 31 |
| 2 | 961 |
| 3 | 2305 |
| 4 | 17563 |
| 5 | 67330 |
| 6 | 178627 |
| 7 | 887114 |
| 8 | 3733566 |
| 9 | 11979209 |
| 10 | 49800326 |
| 11 | 208738438 |
| 12 | 742476229 |
| 13 | 2900533473 |
| 14 | 11843654162 |
| 15 | 44397947317 |
| 16 | 170655647841 |
| 17 | 681016789541 |
| 18 | 2614418854083 |
| 19 | 10044216333681 |
| 20 | 39503065976101 |