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 | 5 |
| 3 | 40 |
| 4 | 440 |
| 5 | 6170 |
| 6 | 105315 |
| 7 | 2120610 |
| 8 | 49242470 |
| 9 | 1296133195 |
| 10 | 38152216495 |
| 11 | 1242274374380 |
| 12 | 44345089721923 |
| 13 | 1722416374173854 |
| 14 | 72330102999829054 |
| 15 | 3265871028909088036 |
| 16 | 157797437377747327987 |
| 17 | 8124524883679977475839 |
| 18 | 444098724261935142753430 |