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 | 26 |
| 4 | 164 |
| 5 | 1224 |
| 6 | 7664 |
| 7 | 51488 |
| 8 | 326456 |
| 9 | 2126376 |
| 10 | 13574046 |
| 11 | 87554326 |
| 12 | 560845908 |
| 13 | 3607790136 |
| 14 | 23158545126 |
| 15 | 148945375022 |
| 16 | 957564479960 |
| 17 | 6162874994108 |
| 18 | 39672627184498 |
| 19 | 255578754020002 |
| 20 | 1647166273816172 |
| 21 | 10622076015026288 |
| 22 | 68529892093271816 |
| 23 | 442357250742603624 |