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 | 6 |
| 1 | 126 |
| 2 | 992 |
| 3 | 4921 |
| 4 | 18450 |
| 5 | 57198 |
| 6 | 154420 |
| 7 | 375106 |
| 8 | 838075 |
| 9 | 1749221 |
| 10 | 3449895 |
| 11 | 6485363 |
| 12 | 11699374 |
| 13 | 20362113 |
| 14 | 34340211 |
| 15 | 56319046 |
| 16 | 90089305 |
| 17 | 140911696 |
| 18 | 215975810 |
| 19 | 324971445 |
| 20 | 480793226 |
| 21 | 700402096 |
| 22 | 1005870222 |
| 23 | 1425639066 |
| 24 | 1996023823 |
| 25 | 2763001135 |
| 26 | 3784320961 |
| 27 | 5131987727 |
| 28 | 6895160406 |
| 29 | 9183525995 |
| 30 | 12131205973 |