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 | 512 |
| 3 | 19682 |
| 4 | 262144 |
| 5 | 1953126 |
| 6 | 10077184 |
| 7 | 40353606 |
| 8 | 134217728 |
| 9 | 387400807 |
| 10 | 1000000512 |
| 11 | 2357947690 |
| 12 | 5159518208 |
| 13 | 10604499374 |
| 14 | 20661046272 |
| 15 | 38441425932 |
| 16 | 68719476736 |
| 17 | 118587876498 |
| 18 | 198349213184 |
| 19 | 322687697778 |
| 20 | 512000262144 |
| 21 | 794239673292 |