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 | 4 |
| 3 | 8 |
| 4 | 17 |
| 5 | 36 |
| 6 | 78 |
| 7 | 170 |
| 8 | 375 |
| 9 | 833 |
| 10 | 1870 |
| 11 | 4229 |
| 12 | 9654 |
| 13 | 22223 |
| 14 | 51622 |
| 15 | 120961 |
| 16 | 286029 |
| 17 | 682398 |
| 18 | 1642821 |
| 19 | 3990231 |
| 20 | 9777678 |
| 21 | 24166327 |
| 22 | 60233185 |
| 23 | 151350709 |
| 24 | 383287499 |
| 25 | 977918150 |
| 26 | 2512805727 |
| 27 | 6500178867 |
| 28 | 16921248231 |
| 29 | 44310852884 |
| 30 | 116678914575 |