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 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 20 |
| 5 | 50 |
| 6 | 126 |
| 7 | 322 |
| 8 | 834 |
| 9 | 2187 |
| 10 | 5797 |
| 11 | 15510 |
| 12 | 41834 |
| 13 | 113633 |
| 14 | 310571 |
| 15 | 853466 |
| 16 | 2356778 |
| 17 | 6536381 |
| 18 | 18199283 |
| 19 | 50852018 |
| 20 | 142547558 |
| 21 | 400763222 |
| 22 | 1129760414 |
| 23 | 3192727796 |
| 24 | 9043402500 |
| 25 | 25669818475 |
| 26 | 73007772801 |
| 27 | 208023278208 |
| 28 | 593742784828 |
| 29 | 1697385471210 |
| 30 | 4859761676390 |