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 | 13 |
| 2 | 58 |
| 3 | 244 |
| 4 | 1000 |
| 5 | 4048 |
| 6 | 16288 |
| 7 | 65344 |
| 8 | 261760 |
| 9 | 1047808 |
| 10 | 4192768 |
| 11 | 16774144 |
| 12 | 67102720 |
| 13 | 268423168 |
| 14 | 1073717248 |
| 15 | 4294918144 |
| 16 | 17179770880 |
| 17 | 68719280128 |
| 18 | 274877513728 |
| 19 | 1099510841344 |
| 20 | 4398044938240 |
| 21 | 17592182898688 |
| 22 | 70368737886208 |