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 | 3 |
| 3 | 6 |
| 4 | 13 |
| 5 | 28 |
| 6 | 66 |
| 7 | 148 |
| 8 | 348 |
| 9 | 812 |
| 10 | 1921 |
| 11 | 4524 |
| 12 | 10708 |
| 13 | 25178 |
| 14 | 59211 |
| 15 | 138578 |
| 16 | 323063 |
| 17 | 747758 |
| 18 | 1716982 |
| 19 | 3896986 |
| 20 | 8715931 |
| 21 | 19121954 |
| 22 | 40976038 |
| 23 | 85326888 |
| 24 | 171723106 |
| 25 | 331830856 |
| 26 | 611054918 |
| 27 | 1062626406 |
| 28 | 1726666853 |
| 29 | 2589026208 |
| 30 | 3530928400 |
| 31 | 4306815278 |
| 32 | 4608896060 |
| 33 | 4238344482 |