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) |
|---|---|
| 1 | 5 |
| 2 | 10 |
| 3 | 30 |
| 4 | 105 |
| 5 | 196 |
| 6 | 1460 |
| 7 | 2010 |
| 8 | 13950 |
| 9 | 37050 |
| 10 | 246542 |
| 11 | 445510 |
| 12 | 5204180 |
| 13 | 7832180 |
| 14 | 72701620 |
| 15 | 254689426 |
| 16 | 1196199375 |
| 17 | 2805046960 |
| 18 | 35322773200 |
| 19 | 55770979190 |
| 20 | 596439488166 |
| 21 | 1892294576710 |
| 22 | 10837222569140 |