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 | 512 |
| 2 | 17536 |
| 3 | 218052 |
| 4 | 1599820 |
| 5 | 8500668 |
| 6 | 36383284 |
| 7 | 133538996 |
| 8 | 437500380 |
| 9 | 1314748124 |
| 10 | 3694894500 |
| 11 | 9849731140 |
| 12 | 25173962492 |
| 13 | 62193359676 |
| 14 | 149475988116 |
| 15 | 351246183572 |
| 16 | 810197361564 |
| 17 | 1840289301660 |
| 18 | 4126688132548 |
| 19 | 9154339355684 |
| 20 | 20122502355004 |
| 21 | 43888598831484 |