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) |
|---|---|
| 4 | 2 |
| 5 | 2 |
| 6 | 8 |
| 7 | 16 |
| 8 | 44 |
| 9 | 108 |
| 10 | 284 |
| 11 | 740 |
| 12 | 1966 |
| 13 | 5254 |
| 14 | 14172 |
| 15 | 38476 |
| 16 | 105122 |
| 17 | 288754 |
| 18 | 797036 |
| 19 | 2209588 |
| 20 | 6149618 |
| 21 | 17176186 |
| 22 | 48129284 |
| 23 | 135261796 |
| 24 | 381169532 |
| 25 | 1076824852 |
| 26 | 3049109912 |
| 27 | 8652239496 |
| 28 | 24600592454 |
| 29 | 70075316198 |
| 30 | 199955694616 |