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 | 2 |
| 2 | 6 |
| 3 | 13 |
| 4 | 35 |
| 5 | 77 |
| 6 | 204 |
| 7 | 453 |
| 8 | 1199 |
| 9 | 2675 |
| 10 | 7089 |
| 11 | 15855 |
| 12 | 42070 |
| 13 | 94228 |
| 14 | 250269 |
| 15 | 561068 |
| 16 | 1491262 |
| 17 | 3345334 |
| 18 | 8896310 |
| 19 | 19966310 |
| 20 | 53118352 |
| 21 | 119257668 |
| 22 | 317373194 |
| 23 | 712742108 |
| 24 | 1897253203 |
| 25 | 4261711183 |
| 26 | 11346582851 |
| 27 | 25491926511 |
| 28 | 67882263130 |