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 | 5 |
| 3 | 13 |
| 4 | 41 |
| 5 | 81 |
| 6 | 257 |
| 7 | 449 |
| 8 | 1313 |
| 9 | 2497 |
| 10 | 6465 |
| 11 | 11265 |
| 12 | 33665 |
| 13 | 53249 |
| 14 | 143617 |
| 15 | 269313 |
| 16 | 672257 |
| 17 | 1114113 |
| 18 | 3159041 |
| 19 | 4980737 |
| 20 | 13568001 |
| 21 | 23904257 |
| 22 | 57675777 |
| 23 | 96468993 |
| 24 | 275980289 |
| 25 | 424673281 |
| 26 | 1090535425 |
| 27 | 1963720705 |
| 28 | 4823482369 |
| 29 | 7784628225 |