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 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 5 |
| 5 | 11 |
| 6 | 17 |
| 7 | 47 |
| 8 | 85 |
| 9 | 227 |
| 10 | 257 |
| 11 | 919 |
| 12 | 1229 |
| 13 | 2459 |
| 14 | 4369 |
| 15 | 9839 |
| 16 | 30865 |
| 17 | 101503 |
| 18 | 148157 |
| 19 | 438499 |
| 20 | 828297 |
| 21 | 2201671 |
| 22 | 3316617 |
| 23 | 11055391 |
| 24 | 35354993 |
| 25 | 140810491 |
| 26 | 188991053 |
| 27 | 377982107 |
| 28 | 848170377 |
| 29 | 1704741139 |
| 30 | 6933926513 |