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 | 0 |
| 2 | 50 |
| 3 | 314 |
| 4 | 2500 |
| 5 | 19014 |
| 6 | 145800 |
| 7 | 1116400 |
| 8 | 8550512 |
| 9 | 65485386 |
| 10 | 501533796 |
| 11 | 3841097940 |
| 12 | 29417832750 |
| 13 | 225302467392 |
| 14 | 1725524876860 |
| 15 | 13215284016064 |
| 16 | 101211946587176 |
| 17 | 775152325067630 |
| 18 | 5936662096954472 |
| 19 | 45467136862793520 |