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 | 19 |
| 3 | 166 |
| 4 | 894 |
| 5 | 5703 |
| 6 | 12654 |
| 7 | 620046 |
| 8 | 4235622 |
| 9 | 24518766 |
| 10 | 133763479 |
| 11 | 575536407 |
| 12 | 7275224659 |
| 13 | 63521178243 |
| 14 | 36407018199 |
| 15 | 1783943891751 |
| 16 | 12048048160062 |
| 17 | 62797942092807 |
| 18 | 615169213046419 |
| 19 | 4293026969512678 |
| 20 | 29406470217788179 |
| 21 | 174254081653289398 |
| 22 | 2627356192258967382 |