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 | 15 |
| 2 | 36 |
| 3 | 100 |
| 4 | 300 |
| 5 | 945 |
| 6 | 3080 |
| 7 | 10296 |
| 8 | 35100 |
| 9 | 121550 |
| 10 | 426360 |
| 11 | 1511640 |
| 12 | 5408312 |
| 13 | 19501125 |
| 14 | 70794000 |
| 15 | 258529200 |
| 16 | 949074300 |
| 17 | 3500409330 |
| 18 | 12964479000 |
| 19 | 48198087000 |
| 20 | 179799820200 |
| 21 | 672822343050 |
| 22 | 2524918756464 |
| 23 | 9500112378000 |
| 24 | 35830670759000 |
| 25 | 135439935469020 |