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 | 1 |
| 1 | 6 |
| 2 | 22 |
| 3 | 90 |
| 4 | 358 |
| 5 | 1434 |
| 6 | 5734 |
| 7 | 22938 |
| 8 | 91750 |
| 9 | 367002 |
| 10 | 1468006 |
| 11 | 5872026 |
| 12 | 23488102 |
| 13 | 93952410 |
| 14 | 375809638 |
| 15 | 1503238554 |
| 16 | 6012954214 |
| 17 | 24051816858 |
| 18 | 96207267430 |
| 19 | 384829069722 |
| 20 | 1539316278886 |
| 21 | 6157265115546 |
| 22 | 24629060462182 |
| 23 | 98516241848730 |
| 24 | 394064967394918 |
| 25 | 1576259869579674 |