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 | 6 |
| 2 | 31 |
| 3 | 217 |
| 4 | 1806 |
| 5 | 13422 |
| 6 | 91755 |
| 7 | 633413 |
| 8 | 4472626 |
| 9 | 30905995 |
| 10 | 209517906 |
| 11 | 1388328518 |
| 12 | 9240921228 |
| 13 | 61120602235 |
| 14 | 401793563633 |
| 15 | 2619241322237 |
| 16 | 17009669381881 |
| 17 | 110033650331158 |
| 18 | 709134941588286 |