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 | 2 |
| 1 | 4 |
| 2 | 8 |
| 3 | 18 |
| 4 | 42 |
| 5 | 100 |
| 6 | 240 |
| 7 | 578 |
| 8 | 1394 |
| 9 | 3364 |
| 10 | 8120 |
| 11 | 19602 |
| 12 | 47322 |
| 13 | 114244 |
| 14 | 275808 |
| 15 | 665858 |
| 16 | 1607522 |
| 17 | 3880900 |
| 18 | 9369320 |
| 19 | 22619538 |
| 20 | 54608394 |
| 21 | 131836324 |
| 22 | 318281040 |
| 23 | 768398402 |
| 24 | 1855077842 |
| 25 | 4478554084 |
| 26 | 10812186008 |
| 27 | 26102926098 |
| 28 | 63018038202 |
| 29 | 152139002500 |
| 30 | 367296043200 |
| 31 | 886731088898 |
| 32 | 2140758220994 |
| 33 | 5168247530884 |