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 | 7 |
| 3 | 32 |
| 4 | 193 |
| 5 | 1382 |
| 6 | 11719 |
| 7 | 112604 |
| 8 | 1221889 |
| 9 | 14639786 |
| 10 | 192949639 |
| 11 | 2760749048 |
| 12 | 42732172993 |
| 13 | 709490574158 |
| 14 | 12596398359367 |
| 15 | 237750425419508 |
| 16 | 4757710386662401 |
| 17 | 100516614496518866 |
| 18 | 2236829315345704711 |
| 19 | 52262526676903613264 |
| 20 | 1279512810244450887361 |