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 | 16 |
| 2 | 41 |
| 3 | 313 |
| 4 | 1152 |
| 5 | 6737 |
| 6 | 28977 |
| 7 | 152048 |
| 8 | 699833 |
| 9 | 3508329 |
| 10 | 16628064 |
| 11 | 81753697 |
| 12 | 392401121 |
| 13 | 1913315024 |
| 14 | 9233466953 |
| 15 | 44861599897 |
| 16 | 217002245696 |
| 17 | 1052716150641 |
| 18 | 5097234627985 |
| 19 | 24711403148208 |
| 20 | 119703506867161 |
| 21 | 580159930998217 |