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 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 16 |
| 6 | 48 |
| 7 | 119 |
| 8 | 390 |
| 9 | 1070 |
| 10 | 3656 |
| 11 | 10762 |
| 12 | 37834 |
| 13 | 116546 |
| 14 | 417540 |
| 15 | 1330923 |
| 16 | 4836452 |
| 17 | 15823388 |
| 18 | 58130756 |
| 19 | 194168612 |
| 20 | 719541996 |
| 21 | 2444224858 |
| 22 | 9121965276 |
| 23 | 31422225930 |
| 24 | 117959864244 |
| 25 | 411141476444 |
| 26 | 1551101290792 |
| 27 | 5460849893348 |
| 28 | 20689450250926 |
| 29 | 73474839110524 |