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 | 3 |
| 2 | 4 |
| 3 | 13 |
| 4 | 18 |
| 5 | 61 |
| 6 | 86 |
| 7 | 293 |
| 8 | 414 |
| 9 | 1413 |
| 10 | 1998 |
| 11 | 6821 |
| 12 | 9646 |
| 13 | 32933 |
| 14 | 46574 |
| 15 | 159013 |
| 16 | 224878 |
| 17 | 767781 |
| 18 | 1085806 |
| 19 | 3707173 |
| 20 | 5242734 |
| 21 | 17899813 |
| 22 | 25314158 |
| 23 | 86427941 |
| 24 | 122227566 |
| 25 | 417311013 |
| 26 | 590166894 |
| 27 | 2014955813 |
| 28 | 2849577838 |
| 29 | 9729067301 |