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 | 3 |
| 2 | 6 |
| 3 | 14 |
| 4 | 32 |
| 5 | 80 |
| 6 | 196 |
| 7 | 508 |
| 8 | 1318 |
| 9 | 3502 |
| 10 | 9382 |
| 11 | 25486 |
| 12 | 69706 |
| 13 | 192346 |
| 14 | 533830 |
| 15 | 1490406 |
| 16 | 4180416 |
| 17 | 11776896 |
| 18 | 33299124 |
| 19 | 94470780 |
| 20 | 268807044 |
| 21 | 766918996 |
| 22 | 2193322744 |
| 23 | 6286504432 |
| 24 | 18054379372 |
| 25 | 51945923740 |
| 26 | 149709932740 |
| 27 | 432139468492 |
| 28 | 1249167599632 |
| 29 | 3615732336352 |