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 | 0 |
| 1 | 5 |
| 2 | 70 |
| 3 | 239 |
| 4 | 143044 |
| 5 | 1999509 |
| 6 | 6826318 |
| 7 | 822557039 |
| 8 | 85658552023 |
| 9 | 1188526486815 |
| 10 | 11941488851037 |
| 11 | 291518510320809 |
| 12 | 2108769149874327 |
| 13 | 13920898306972194 |
| 14 | 2675587335039691558 |
| 15 | 63228498770709057089 |