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 | 10 |
| 1 | 80 |
| 2 | 440 |
| 3 | 1820 |
| 4 | 6545 |
| 5 | 20630 |
| 6 | 59960 |
| 7 | 161840 |
| 8 | 412950 |
| 9 | 1002435 |
| 10 | 2335760 |
| 11 | 5246120 |
| 12 | 11416820 |
| 13 | 24146510 |
| 14 | 49795175 |
| 15 | 100348950 |
| 16 | 198063060 |
| 17 | 383516700 |
| 18 | 729726660 |
| 19 | 1366124700 |
| 20 | 2519441030 |
| 21 | 4581865140 |
| 22 | 8224627160 |
| 23 | 14584074770 |
| 24 | 25565740130 |
| 25 | 44334556890 |
| 26 | 76102268520 |