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 | 8 |
| 3 | 9 |
| 4 | 463 |
| 5 | 1057 |
| 6 | 4010 |
| 7 | 570097 |
| 8 | 32903 |
| 9 | 828667 |
| 10 | 25743541 |
| 11 | 431266313 |
| 12 | 16610986697 |
| 13 | 16089123031 |
| 14 | 1971622002613 |
| 15 | 2723872673 |
| 16 | 159888988030039 |
| 17 | 377543463271 |
| 18 | 12771918729143 |
| 19 | 19566551419628659 |
| 20 | 2983570575161357 |
| 21 | 1774565709813223 |