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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 13 |
| 6 | 29 |
| 7 | 58 |
| 8 | 124 |
| 9 | 280 |
| 10 | 632 |
| 11 | 1406 |
| 12 | 3101 |
| 13 | 6851 |
| 14 | 15217 |
| 15 | 33846 |
| 16 | 75181 |
| 17 | 166823 |
| 18 | 370177 |
| 19 | 821760 |
| 20 | 1824620 |
| 21 | 4051056 |
| 22 | 8993220 |
| 23 | 19964240 |
| 24 | 44320545 |
| 25 | 98393849 |
| 26 | 218438981 |
| 27 | 484939834 |
| 28 | 1076573833 |
| 29 | 2390015565 |
| 30 | 5305896445 |
| 31 | 11779231650 |