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 | 36 |
| 3 | 196 |
| 4 | 1156 |
| 5 | 6724 |
| 6 | 39204 |
| 7 | 228484 |
| 8 | 1331716 |
| 9 | 7761796 |
| 10 | 45239076 |
| 11 | 263672644 |
| 12 | 1536796804 |
| 13 | 8957108164 |
| 14 | 52205852196 |
| 15 | 304278004996 |
| 16 | 1773462177796 |
| 17 | 10336495061764 |
| 18 | 60245508192804 |
| 19 | 351136554095044 |
| 20 | 2046573816377476 |
| 21 | 11928306344169796 |
| 22 | 69523264248641316 |