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 | 3 |
| 3 | 4 |
| 4 | 11 |
| 5 | 21 |
| 6 | 48 |
| 7 | 106 |
| 8 | 235 |
| 9 | 535 |
| 10 | 1203 |
| 11 | 2751 |
| 12 | 6272 |
| 13 | 14392 |
| 14 | 33078 |
| 15 | 76224 |
| 16 | 176043 |
| 17 | 407253 |
| 18 | 943833 |
| 19 | 2190397 |
| 20 | 5090371 |
| 21 | 11843689 |
| 22 | 27586793 |
| 23 | 64320191 |
| 24 | 150102784 |
| 25 | 350586496 |
| 26 | 819477792 |
| 27 | 1916861350 |
| 28 | 4486760870 |
| 29 | 10508582130 |
| 30 | 24626700888 |