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 | 13 |
| 2 | 130 |
| 3 | 1106 |
| 4 | 8575 |
| 5 | 62475 |
| 6 | 435576 |
| 7 | 2939208 |
| 8 | 19342285 |
| 9 | 124800361 |
| 10 | 792586270 |
| 11 | 4969028750 |
| 12 | 30822650251 |
| 13 | 189500937303 |
| 14 | 1156406300340 |
| 15 | 7012380492516 |
| 16 | 42294614785465 |
| 17 | 253926386816725 |
| 18 | 1518506730836026 |
| 19 | 9050029200532298 |
| 20 | 53778595325886295 |
| 21 | 318762380704793571 |
| 22 | 1885254096749834160 |