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 | 10 |
| 2 | 38 |
| 3 | 150 |
| 4 | 598 |
| 5 | 2390 |
| 6 | 9558 |
| 7 | 38230 |
| 8 | 152918 |
| 9 | 611670 |
| 10 | 2446678 |
| 11 | 9786710 |
| 12 | 39146838 |
| 13 | 156587350 |
| 14 | 626349398 |
| 15 | 2505397590 |
| 16 | 10021590358 |
| 17 | 40086361430 |
| 18 | 160345445718 |
| 19 | 641381782870 |
| 20 | 2565527131478 |
| 21 | 10262108525910 |
| 22 | 41048434103638 |
| 23 | 164193736414550 |
| 24 | 656774945658198 |
| 25 | 2627099782632790 |