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 | 7 |
| 2 | 49 |
| 3 | 211 |
| 4 | 847 |
| 5 | 3282 |
| 6 | 12405 |
| 7 | 45860 |
| 8 | 167525 |
| 9 | 605878 |
| 10 | 2177496 |
| 11 | 7787333 |
| 12 | 27757367 |
| 13 | 98687854 |
| 14 | 350247594 |
| 15 | 1241371867 |
| 16 | 4395505741 |
| 17 | 15552531864 |
| 18 | 55000200159 |
| 19 | 194426956404 |
| 20 | 687105218857 |
| 21 | 2427709127594 |
| 22 | 8576325199050 |
| 23 | 30293865359314 |