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 | 24 |
| 2 | 140 |
| 3 | 646 |
| 4 | 3556 |
| 5 | 20240 |
| 6 | 113884 |
| 7 | 645780 |
| 8 | 3685550 |
| 9 | 21117750 |
| 10 | 121503530 |
| 11 | 701432670 |
| 12 | 4060132070 |
| 13 | 23557575574 |
| 14 | 136975281374 |
| 15 | 797920002262 |
| 16 | 4655761528566 |
| 17 | 27205829211568 |
| 18 | 159187551327960 |
| 19 | 932560727269722 |