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) |
|---|---|
| 3 | 5 |
| 4 | 161 |
| 5 | 3744 |
| 6 | 80784 |
| 7 | 1749969 |
| 8 | 39305685 |
| 9 | 928825464 |
| 10 | 23244466392 |
| 11 | 617591825445 |
| 12 | 17426790660465 |
| 13 | 521767015888200 |
| 14 | 16550044554184920 |
| 15 | 555080426233315521 |
| 16 | 19645031754312701685 |
| 17 | 732117928079412794832 |
| 18 | 28671309640088889743760 |
| 19 | 1177581551918650706931813 |
| 20 | 50628032440197924505694433 |