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 | 2 |
| 1 | 29 |
| 2 | 408 |
| 3 | 5741 |
| 4 | 80782 |
| 5 | 1136689 |
| 6 | 15994428 |
| 7 | 225058681 |
| 8 | 3166815962 |
| 9 | 44560482149 |
| 10 | 627013566048 |
| 11 | 8822750406821 |
| 12 | 124145519261542 |
| 13 | 1746860020068409 |
| 14 | 24580185800219268 |
| 15 | 345869461223138161 |
| 16 | 4866752642924153522 |
| 17 | 68480406462161287469 |
| 18 | 963592443113182178088 |
| 19 | 13558774610046711780701 |