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 | 55 |
| 2 | 715 |
| 3 | 5005 |
| 4 | 24310 |
| 5 | 92378 |
| 6 | 293930 |
| 7 | 817190 |
| 8 | 2042975 |
| 9 | 4686825 |
| 10 | 10015005 |
| 11 | 20160075 |
| 12 | 38567100 |
| 13 | 70607460 |
| 14 | 124403620 |
| 15 | 211915132 |
| 16 | 350343565 |
| 17 | 563921995 |
| 18 | 886163135 |
| 19 | 1362649145 |
| 20 | 2054455634 |
| 21 | 3042312350 |
| 22 | 4431613550 |
| 23 | 6358402050 |
| 24 | 8996462475 |
| 25 | 12565671261 |
| 26 | 17341763505 |