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 | 80 |
| 2 | 276 |
| 3 | 1082 |
| 4 | 4460 |
| 5 | 18890 |
| 6 | 81606 |
| 7 | 358564 |
| 8 | 1599820 |
| 9 | 7238864 |
| 10 | 33175486 |
| 11 | 153802520 |
| 12 | 720390254 |
| 13 | 3404944506 |
| 14 | 16221905696 |
| 15 | 77820675992 |
| 16 | 375564803020 |
| 17 | 1821845982082 |
| 18 | 8876847931644 |
| 19 | 43416046650306 |
| 20 | 213033152875350 |
| 21 | 1048198981050148 |
| 22 | 5169676077206180 |