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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 26 |
| 5 | 141 |
| 6 | 751 |
| 7 | 4337 |
| 8 | 25512 |
| 9 | 154839 |
| 10 | 956877 |
| 11 | 6014098 |
| 12 | 38292603 |
| 13 | 246550449 |
| 14 | 1602304287 |
| 15 | 10497348917 |
| 16 | 69253008919 |
| 17 | 459673679526 |
| 18 | 3067621127220 |
| 19 | 20570132531365 |
| 20 | 138528107124822 |
| 21 | 936524246563021 |
| 22 | 6353624897677005 |
| 23 | 43242243814689566 |
| 24 | 295161330408772329 |