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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 16 |
| 6 | 63 |
| 7 | 246 |
| 8 | 1201 |
| 9 | 5632 |
| 10 | 30776 |
| 11 | 166800 |
| 12 | 1032537 |
| 13 | 6404960 |
| 14 | 44200745 |
| 15 | 305485130 |
| 16 | 2305218366 |
| 17 | 17475547664 |
| 18 | 143075155975 |
| 19 | 1179769331662 |
| 20 | 10409877747841 |
| 21 | 92570178170528 |
| 22 | 873953428860952 |
| 23 | 8318955989166944 |
| 24 | 83562716138732321 |
| 25 | 846729015766650672 |