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 | 1 |
| 2 | 5 |
| 3 | 43 |
| 4 | 463 |
| 5 | 5193 |
| 6 | 58653 |
| 7 | 663203 |
| 8 | 7500343 |
| 9 | 84825873 |
| 10 | 959351093 |
| 11 | 10849935003 |
| 12 | 122709094303 |
| 13 | 1387798370393 |
| 14 | 15695530423373 |
| 15 | 177511143297043 |
| 16 | 2007591024144903 |
| 17 | 22705175829637153 |
| 18 | 256787863292718693 |
| 19 | 2904183928335418123 |
| 20 | 32845338488555237743 |