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 | 3 |
| 2 | 12 |
| 3 | 25 |
| 4 | 75 |
| 5 | 144 |
| 6 | 357 |
| 7 | 615 |
| 8 | 1380 |
| 9 | 2285 |
| 10 | 4767 |
| 11 | 7488 |
| 12 | 14817 |
| 13 | 22707 |
| 14 | 43068 |
| 15 | 63769 |
| 16 | 116667 |
| 17 | 169584 |
| 18 | 301589 |
| 19 | 427815 |
| 20 | 741396 |
| 21 | 1037149 |
| 22 | 1761087 |
| 23 | 2418432 |
| 24 | 4025153 |
| 25 | 5465955 |
| 26 | 8956716 |
| 27 | 11986009 |
| 28 | 19330347 |
| 29 | 25633296 |
| 30 | 40835973 |
| 31 | 53508711 |
| 32 | 84129156 |
| 33 | 109392269 |
| 34 | 170278047 |
| 35 | 219206976 |