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) |
|---|---|
| 2 | 2 |
| 3 | 18 |
| 4 | 136 |
| 5 | 1030 |
| 6 | 7992 |
| 7 | 63796 |
| 8 | 522474 |
| 9 | 4369840 |
| 10 | 37179840 |
| 11 | 320861342 |
| 12 | 2802304988 |
| 13 | 24725041598 |
| 14 | 220077128644 |
| 15 | 1973963065574 |