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 | 13 |
| 3 | 144 |
| 4 | 1597 |
| 5 | 10946 |
| 6 | 121393 |
| 7 | 1346269 |
| 8 | 14930352 |
| 9 | 102334155 |
| 10 | 1134903170 |
| 11 | 12586269025 |
| 12 | 139583862445 |
| 13 | 1548008755920 |
| 14 | 10610209857723 |
| 15 | 117669030460994 |
| 16 | 1304969544928657 |
| 17 | 14472334024676221 |
| 18 | 160500643816367088 |
| 19 | 1100087778366101931 |
| 20 | 12200160415121876738 |