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 | 1 |
| 2 | 20 |
| 3 | 380 |
| 4 | 7064 |
| 5 | 129740 |
| 6 | 2368008 |
| 7 | 43069168 |
| 8 | 781583572 |
| 9 | 14160543572 |
| 10 | 256233400004 |
| 11 | 4631789851254 |