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 | 3 |
| 2 | 14 |
| 3 | 115 |
| 4 | 1474 |
| 5 | 26306 |
| 6 | 605538 |
| 7 | 17116241 |
| 8 | 574398861 |
| 9 | 22333212354 |
| 10 | 987660842174 |
| 11 | 48969675370286 |
| 12 | 2690888441513773 |
| 13 | 162333780684342177 |
| 14 | 10667116965172284025 |
| 15 | 758434434866124781819 |
| 16 | 58015602766701416940599 |
| 17 | 4750972163883049286678765 |
| 18 | 414721061026426313701858479 |