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 | 2 |
| 2 | 8 |
| 3 | 26 |
| 4 | 112 |
| 5 | 410 |
| 6 | 1860 |
| 7 | 8074 |
| 8 | 40376 |
| 9 | 199050 |
| 10 | 1085232 |
| 11 | 5923394 |
| 12 | 34842408 |
| 13 | 206403234 |
| 14 | 1295653484 |
| 15 | 8219293954 |
| 16 | 54613967584 |
| 17 | 367414298386 |
| 18 | 2567777927672 |
| 19 | 18187100499306 |
| 20 | 133016727225888 |
| 21 | 986352813933034 |
| 22 | 7518613974827732 |
| 23 | 58110359176236314 |
| 24 | 460095738657984024 |