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 | 1 |
| 2 | 3 |
| 3 | 24 |
| 4 | 291 |
| 5 | 4596 |
| 6 | 88230 |
| 7 | 1979088 |
| 8 | 50570823 |
| 9 | 1446341388 |
| 10 | 45706515546 |
| 11 | 1580322048288 |
| 12 | 59318131995822 |
| 13 | 2401809350808552 |
| 14 | 104347127373249036 |
| 15 | 4842030589556434656 |
| 16 | 239028273094016840223 |
| 17 | 12508863342589554285372 |
| 18 | 691783629316556340447570 |
| 19 | 40316336264435949765811968 |