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 | 20 |
| 2 | 175 |
| 3 | 980 |
| 4 | 4116 |
| 5 | 14112 |
| 6 | 41580 |
| 7 | 108900 |
| 8 | 259545 |
| 9 | 572572 |
| 10 | 1184183 |
| 11 | 2318680 |
| 12 | 4331600 |
| 13 | 7768320 |
| 14 | 13441968 |
| 15 | 22535064 |
| 16 | 36729945 |
| 17 | 58373700 |
| 18 | 90684055 |
| 19 | 138003404 |
| 20 | 206108980 |
| 21 | 302588000 |
| 22 | 437287500 |
| 23 | 622849500 |
| 24 | 875343105 |
| 25 | 1215006156 |
| 26 | 1667110095 |