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 | 0 |
| 1 | 1024 |
| 2 | 1048576 |
| 3 | 60466176 |
| 4 | 1073741824 |
| 5 | 10000000000 |
| 6 | 61917364224 |
| 7 | 289254654976 |
| 8 | 1099511627776 |
| 9 | 3570467226624 |
| 10 | 10240000000000 |
| 11 | 26559922791424 |
| 12 | 63403380965376 |
| 13 | 141167095653376 |
| 14 | 296196766695424 |
| 15 | 590490000000000 |
| 16 | 1125899906842624 |
| 17 | 2064377754059776 |
| 18 | 3656158440062976 |