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 | 12 |
| 2 | 40 |
| 3 | 160 |
| 4 | 2176 |
| 5 | 10240 |
| 6 | 139264 |
| 7 | 655360 |
| 8 | 8912896 |
| 9 | 545259520 |
| 10 | 2684354560 |
| 11 | 139586437120 |
| 12 | 2336462209024 |
| 13 | 10995116277760 |
| 14 | 149533581377536 |
| 15 | 9147936743096320 |
| 16 | 585467951558164480 |
| 17 | 2882303761517117440 |
| 18 | 149879795598890106880 |
| 19 | 2508757194024499019776 |
| 20 | 11805916207174113034240 |