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 | 35 |
| 5 | 126 |
| 6 | 456 |
| 7 | 1667 |
| 8 | 6147 |
| 9 | 22825 |
| 10 | 85228 |
| 11 | 319683 |
| 12 | 1203632 |
| 13 | 4546270 |
| 14 | 17218995 |
| 15 | 65372310 |
| 16 | 248705155 |
| 17 | 947926359 |
| 18 | 3618884895 |
| 19 | 13836004764 |
| 20 | 52968655260 |
| 21 | 203022926480 |
| 22 | 779008308235 |
| 23 | 2992051471500 |
| 24 | 11502445734096 |
| 25 | 44256184906376 |
| 26 | 170408995261326 |