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 | 3 |
| 2 | 4 |
| 3 | 11 |
| 4 | 29 |
| 5 | 199 |
| 6 | 521 |
| 7 | 3571 |
| 8 | 9349 |
| 9 | 64079 |
| 10 | 1149851 |
| 11 | 3010349 |
| 12 | 54018521 |
| 13 | 370248451 |
| 14 | 969323029 |
| 15 | 6643838879 |
| 16 | 119218851371 |
| 17 | 2139295485799 |
| 18 | 5600748293801 |
| 19 | 100501350283429 |
| 20 | 688846502588399 |
| 21 | 1803423556807921 |
| 22 | 32361122672259149 |
| 23 | 221806434537978679 |