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 | 5 |
| 3 | 47 |
| 4 | 103 |
| 5 | 461 |
| 6 | 21211 |
| 7 | 24183 |
| 8 | 62081 |
| 9 | 735503 |
| 10 | 38230051 |
| 11 | 4501873 |
| 12 | 40137823 |
| 13 | 1571907737 |
| 14 | 776878687 |
| 15 | 13914337609 |
| 16 | 13784887072529 |
| 17 | 93498082849 |
| 18 | 1626565056793 |
| 19 | 25260167753 |
| 20 | 213051987097 |
| 21 | 15224249929987129 |