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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 17 |
| 7 | 34 |
| 8 | 99 |
| 9 | 198 |
| 10 | 577 |
| 11 | 1154 |
| 12 | 3363 |
| 13 | 6726 |
| 14 | 19601 |
| 15 | 39202 |
| 16 | 114243 |
| 17 | 228486 |
| 18 | 665857 |
| 19 | 1331714 |
| 20 | 3880899 |
| 21 | 7761798 |
| 22 | 22619537 |
| 23 | 45239074 |
| 24 | 131836323 |
| 25 | 263672646 |
| 26 | 768398401 |
| 27 | 1536796802 |
| 28 | 4478554083 |
| 29 | 8957108166 |
| 30 | 26102926097 |
| 31 | 52205852194 |
| 32 | 152139002499 |
| 33 | 304278004998 |
| 34 | 886731088897 |