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) |
|---|---|
| 2 | 3 |
| 3 | 45 |
| 4 | 210 |
| 5 | 630 |
| 6 | 1485 |
| 7 | 3003 |
| 8 | 5460 |
| 9 | 9180 |
| 10 | 14535 |
| 11 | 21945 |
| 12 | 31878 |
| 13 | 44850 |
| 14 | 61425 |
| 15 | 82215 |
| 16 | 107880 |
| 17 | 139128 |
| 18 | 176715 |
| 19 | 221445 |
| 20 | 274170 |
| 21 | 335790 |
| 22 | 407253 |
| 23 | 489555 |
| 24 | 583740 |
| 25 | 690900 |
| 26 | 812175 |
| 27 | 948753 |
| 28 | 1101870 |
| 29 | 1272810 |
| 30 | 1462905 |
| 31 | 1673535 |
| 32 | 1906128 |
| 33 | 2162160 |
| 34 | 2443155 |