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 | 0 |
| 2 | 10 |
| 3 | 78 |
| 4 | 153 |
| 5 | 946 |
| 6 | 177310 |
| 7 | 450775 |
| 8 | 13595505 |
| 9 | 150988753 |
| 10 | 4478601403 |
| 11 | 5409300078 |
| 12 | 5589152128 |
| 13 | 76060335351 |
| 14 | 248156250265 |
| 15 | 1793751529485 |
| 16 | 176149383165876 |
| 17 | 187718592284301 |
| 18 | 233626949305596 |
| 19 | 11362376565228270 |
| 20 | 18886935830647605 |
| 21 | 1943937379018997076 |