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 | 1 |
| 1 | 7 |
| 2 | 36 |
| 3 | 505 |
| 4 | 1516 |
| 5 | 16677 |
| 6 | 216802 |
| 7 | 433605 |
| 8 | 7371286 |
| 9 | 140054435 |
| 10 | 140054436 |
| 11 | 3221252029 |
| 12 | 16106260146 |
| 13 | 48318780439 |
| 14 | 1401244632732 |
| 15 | 86877167229385 |
| 16 | 86877167229386 |
| 17 | 86877167229387 |
| 18 | 3214455187487320 |
| 19 | 3214455187487321 |