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 | 10 |
| 4 | 13 |
| 5 | 36 |
| 6 | 121 |
| 7 | 157 |
| 8 | 435 |
| 9 | 1462 |
| 10 | 1897 |
| 11 | 5256 |
| 12 | 17665 |
| 13 | 22921 |
| 14 | 63507 |
| 15 | 213442 |
| 16 | 276949 |
| 17 | 767340 |
| 18 | 2578969 |
| 19 | 3346309 |
| 20 | 9271587 |
| 21 | 31161070 |
| 22 | 40432657 |
| 23 | 112026384 |
| 24 | 376511809 |
| 25 | 488538193 |
| 26 | 1353588195 |
| 27 | 4549302778 |
| 28 | 5902890973 |
| 29 | 16355084724 |