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 | 102 |
| 3 | 2892 |
| 4 | 57460 |
| 5 | 882030 |
| 6 | 11053434 |
| 7 | 117206264 |
| 8 | 1078467624 |
| 9 | 8774904690 |
| 10 | 64062783510 |
| 11 | 424600608564 |
| 12 | 2579499722124 |
| 13 | 14479567043214 |
| 14 | 75613799423610 |
| 15 | 369504358622640 |
| 16 | 1698353774374704 |
| 17 | 7375213677918294 |
| 18 | 30379740299612514 |
| 19 | 119122913376492980 |
| 20 | 446056011713374860 |