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 | 5 |
| 2 | 35 |
| 3 | 210 |
| 4 | 1290 |
| 5 | 7735 |
| 6 | 46620 |
| 7 | 279685 |
| 8 | 1679370 |
| 9 | 10076190 |
| 10 | 60464670 |
| 11 | 362787810 |
| 12 | 2176773305 |
| 13 | 13060638360 |
| 14 | 78364108620 |
| 15 | 470184650495 |
| 16 | 2821109573550 |
| 17 | 16926657432510 |
| 18 | 101559954663930 |
| 19 | 609359727929610 |
| 20 | 3656158427989830 |
| 21 | 21936950567886270 |
| 22 | 131621703769781995 |