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 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 22 |
| 6 | 53 |
| 7 | 211 |
| 8 | 554 |
| 9 | 2306 |
| 10 | 6362 |
| 11 | 27230 |
| 12 | 77580 |
| 13 | 338444 |
| 14 | 986253 |
| 15 | 4362627 |
| 16 | 12927170 |
| 17 | 57788170 |
| 18 | 173452334 |
| 19 | 781825066 |
| 20 | 2370742868 |
| 21 | 10757497972 |
| 22 | 32892031042 |
| 23 | 150073096238 |
| 24 | 462030186916 |
| 25 | 2117778107732 |
| 26 | 6557906929108 |
| 27 | 30176799215196 |
| 28 | 93909078262808 |