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 | 3 |
| 2 | 15 |
| 3 | 95 |
| 4 | 681 |
| 5 | 5277 |
| 6 | 43086 |
| 7 | 365313 |
| 8 | 3186444 |
| 9 | 28414802 |
| 10 | 257908020 |
| 11 | 2375037477 |
| 12 | 22136623447 |
| 13 | 208438845633 |
| 14 | 1979867655945 |
| 15 | 18948498050586 |
| 16 | 182549617674339 |
| 17 | 1768943859449895 |
| 18 | 17230208981859485 |