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 | 4 |
| 2 | 160 |
| 3 | 2172 |
| 4 | 47571 |
| 5 | 868613 |
| 6 | 16284544 |
| 7 | 298587595 |
| 8 | 5442431797 |
| 9 | 99386232806 |
| 10 | 1803702025944 |
| 11 | 32778396578439 |
| 12 | 594763583660497 |
| 13 | 10789731888817704 |
| 14 | 195712516698029249 |
| 15 | 3549147337219998085 |
| 16 | 64361582471647592799 |