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 | 0 |
| 2 | 2 |
| 3 | 4374 |
| 4 | 259289 |
| 5 | 4255370 |
| 6 | 35093344 |
| 7 | 189681689 |
| 8 | 771464278 |
| 9 | 2559099153 |
| 10 | 7285273805 |
| 11 | 18416621598 |
| 12 | 42342480425 |
| 13 | 90097012004 |
| 14 | 179755977430 |
| 15 | 339666241815 |
| 16 | 612682858064 |
| 17 | 1061605357051 |
| 18 | 1776021648675 |
| 19 | 2880784715492 |