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 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 12 |
| 5 | 24 |
| 6 | 55 |
| 7 | 119 |
| 8 | 272 |
| 9 | 612 |
| 10 | 1411 |
| 11 | 3247 |
| 12 | 7565 |
| 13 | 17667 |
| 14 | 41561 |
| 15 | 98099 |
| 16 | 232696 |
| 17 | 553784 |
| 18 | 1322813 |
| 19 | 3169065 |
| 20 | 7614583 |
| 21 | 18342921 |
| 22 | 44294991 |
| 23 | 107200829 |
| 24 | 259983346 |
| 25 | 631718606 |
| 26 | 1537737567 |
| 27 | 3749440151 |
| 28 | 9156561590 |
| 29 | 22394270034 |
| 30 | 54845701243 |