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 | 3 |
| 1 | 7 |
| 2 | 18 |
| 3 | 52 |
| 4 | 168 |
| 5 | 592 |
| 6 | 2208 |
| 7 | 8512 |
| 8 | 33408 |
| 9 | 132352 |
| 10 | 526848 |
| 11 | 2102272 |
| 12 | 8398848 |
| 13 | 33574912 |
| 14 | 134258688 |
| 15 | 536952832 |
| 16 | 2147647488 |
| 17 | 8590262272 |
| 18 | 34360393728 |
| 19 | 137440264192 |
| 20 | 549758435328 |
| 21 | 2199028498432 |
| 22 | 8796103507968 |
| 23 | 35184393060352 |
| 24 | 140737530298368 |
| 25 | 562950037307392 |