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) |
|---|---|
| 0 | 2 |
| 1 | 6 |
| 2 | 34 |
| 3 | 198 |
| 4 | 1154 |
| 5 | 6726 |
| 6 | 39202 |
| 7 | 228486 |
| 8 | 1331714 |
| 9 | 7761798 |
| 10 | 45239074 |
| 11 | 263672646 |
| 12 | 1536796802 |
| 13 | 8957108166 |
| 14 | 52205852194 |
| 15 | 304278004998 |
| 16 | 1773462177794 |
| 17 | 10336495061766 |
| 18 | 60245508192802 |
| 19 | 351136554095046 |
| 20 | 2046573816377474 |
| 21 | 11928306344169798 |
| 22 | 69523264248641314 |