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 | 2 |
| 2 | 31 |
| 3 | 503 |
| 4 | 7001 |
| 5 | 11003 |
| 6 | 130003 |
| 7 | 1700021 |
| 8 | 19000013 |
| 9 | 230000003 |
| 10 | 2900000017 |
| 11 | 31000000027 |
| 12 | 370000000003 |
| 13 | 4100000000003 |
| 14 | 43000000000063 |
| 15 | 470000000000023 |
| 16 | 5300000000000129 |
| 17 | 59000000000000011 |
| 18 | 610000000000000031 |
| 19 | 6700000000000000021 |
| 20 | 71000000000000000047 |
| 21 | 730000000000000000001 |