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 | 3 |
| 2 | 6 |
| 3 | 15 |
| 4 | 30 |
| 5 | 70 |
| 6 | 140 |
| 7 | 315 |
| 8 | 630 |
| 9 | 1386 |
| 10 | 2772 |
| 11 | 6006 |
| 12 | 12012 |
| 13 | 25740 |
| 14 | 51480 |
| 15 | 109395 |
| 16 | 218790 |
| 17 | 461890 |
| 18 | 923780 |
| 19 | 1939938 |
| 20 | 3879876 |
| 21 | 8112468 |
| 22 | 16224936 |
| 23 | 33801950 |
| 24 | 67603900 |
| 25 | 140408100 |
| 26 | 280816200 |
| 27 | 581690700 |
| 28 | 1163381400 |
| 29 | 2404321560 |
| 30 | 4808643120 |
| 31 | 9917826435 |
| 32 | 19835652870 |