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 | 5 |
| 1 | 12 |
| 2 | 29 |
| 3 | 71 |
| 4 | 174 |
| 5 | 427 |
| 6 | 1048 |
| 7 | 2573 |
| 8 | 6318 |
| 9 | 15514 |
| 10 | 38095 |
| 11 | 93544 |
| 12 | 229702 |
| 13 | 564045 |
| 14 | 1385042 |
| 15 | 3401044 |
| 16 | 8351444 |
| 17 | 20507414 |
| 18 | 50357044 |
| 19 | 123654396 |
| 20 | 303639937 |
| 21 | 745603993 |
| 22 | 1830870208 |
| 23 | 4495799044 |
| 24 | 11039673351 |
| 25 | 27108504296 |
| 26 | 66566372193 |
| 27 | 163457262657 |
| 28 | 401377990645 |