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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 28 |
| 4 | 91 |
| 5 | 308 |
| 6 | 1079 |
| 7 | 3888 |
| 8 | 14332 |
| 9 | 53810 |
| 10 | 205075 |
| 11 | 791250 |
| 12 | 3084504 |
| 13 | 12129506 |
| 14 | 48056095 |
| 15 | 191633546 |
| 16 | 768535768 |
| 17 | 3097705378 |
| 18 | 12541851048 |
| 19 | 50983349848 |
| 20 | 208003171266 |
| 21 | 851412895348 |
| 22 | 3495527318559 |
| 23 | 14390543072502 |
| 24 | 59393240482618 |