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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 28 |
| 7 | 65 |
| 8 | 149 |
| 9 | 341 |
| 10 | 778 |
| 11 | 1774 |
| 12 | 4045 |
| 13 | 9222 |
| 14 | 21023 |
| 15 | 47925 |
| 16 | 109251 |
| 17 | 249051 |
| 18 | 567740 |
| 19 | 1294227 |
| 20 | 2950334 |
| 21 | 6725613 |
| 22 | 15331778 |
| 23 | 34950481 |
| 24 | 79673480 |
| 25 | 181624492 |
| 26 | 414033077 |
| 27 | 943834098 |
| 28 | 2151574001 |
| 29 | 4904750412 |
| 30 | 11180919918 |