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 | 14 |
| 3 | 152 |
| 4 | 1512 |
| 5 | 14480 |
| 6 | 136192 |
| 7 | 1269568 |
| 8 | 11781504 |
| 9 | 109080064 |
| 10 | 1008734720 |
| 11 | 9322763264 |
| 12 | 86134358016 |
| 13 | 795679428608 |
| 14 | 7349600247808 |
| 15 | 67884508610560 |
| 16 | 627000709644288 |
| 17 | 5791091556155392 |
| 18 | 53487250561826816 |
| 19 | 494013479394738176 |