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 | 3 |
| 2 | 40 |
| 3 | 546 |
| 4 | 7728 |
| 5 | 112035 |
| 6 | 1650792 |
| 7 | 24608948 |
| 8 | 370084832 |
| 9 | 5603730876 |
| 10 | 85316186400 |
| 11 | 1304770191802 |
| 12 | 20029132137840 |
| 13 | 308437355259930 |
| 14 | 4762695514958640 |
| 15 | 73716196036213800 |
| 16 | 1143325208566357440 |
| 17 | 17765127399780725316 |
| 18 | 276484586847524844768 |
| 19 | 4309270265307160983144 |