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 | 8 |
| 2 | 72 |
| 3 | 622 |
| 4 | 5318 |
| 5 | 45417 |
| 6 | 387852 |
| 7 | 3312153 |
| 8 | 28284912 |
| 9 | 241545633 |
| 10 | 2062735514 |
| 11 | 17615213065 |
| 12 | 150429237853 |
| 13 | 1284625710591 |
| 14 | 10970362144062 |
| 15 | 93683977036770 |
| 16 | 800036264817077 |
| 17 | 6832097070038330 |
| 18 | 58344293161634133 |
| 19 | 498244757010106385 |