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 | 1 |
| 1 | 5 |
| 2 | 73 |
| 3 | 989 |
| 4 | 12241 |
| 5 | 144245 |
| 6 | 1653913 |
| 7 | 18663629 |
| 8 | 208594081 |
| 9 | 2317594085 |
| 10 | 25654949353 |
| 11 | 283334343869 |
| 12 | 3124587089521 |
| 13 | 34425823133525 |
| 14 | 379071610510393 |
| 15 | 4172500607905709 |
| 16 | 45916496933002561 |
| 17 | 505214397985306565 |
| 18 | 5558288899894321033 |
| 19 | 61147691553229173149 |