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 | 6 |
| 2 | 7 |
| 3 | 20 |
| 4 | 47 |
| 5 | 114 |
| 6 | 275 |
| 7 | 664 |
| 8 | 1603 |
| 9 | 3870 |
| 10 | 9343 |
| 11 | 22556 |
| 12 | 54455 |
| 13 | 131466 |
| 14 | 317387 |
| 15 | 766240 |
| 16 | 1849867 |
| 17 | 4465974 |
| 18 | 10781815 |
| 19 | 26029604 |
| 20 | 62841023 |
| 21 | 151711650 |
| 22 | 366264323 |
| 23 | 884240296 |
| 24 | 2134744915 |
| 25 | 5153730126 |
| 26 | 12442205167 |
| 27 | 30038140460 |
| 28 | 72518486087 |
| 29 | 175075112634 |