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 | 64 |
| 1 | 262144 |
| 2 | 7529536 |
| 3 | 64000000 |
| 4 | 308915776 |
| 5 | 1073741824 |
| 6 | 3010936384 |
| 7 | 7256313856 |
| 8 | 15625000000 |
| 9 | 30840979456 |
| 10 | 56800235584 |
| 11 | 98867482624 |
| 12 | 164206490176 |
| 13 | 262144000000 |
| 14 | 404567235136 |
| 15 | 606355001344 |
| 16 | 885842380864 |
| 17 | 1265319018496 |
| 18 | 1771561000000 |
| 19 | 2436396322816 |
| 20 | 3297303959104 |