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 | 2 |
| 1 | 6 |
| 2 | 30 |
| 3 | 110 |
| 4 | 306 |
| 5 | 702 |
| 6 | 1406 |
| 7 | 2550 |
| 8 | 4290 |
| 9 | 6806 |
| 10 | 10302 |
| 11 | 15006 |
| 12 | 21170 |
| 13 | 29070 |
| 14 | 39006 |
| 15 | 51302 |
| 16 | 66306 |
| 17 | 84390 |
| 18 | 105950 |
| 19 | 131406 |
| 20 | 161202 |
| 21 | 195806 |
| 22 | 235710 |
| 23 | 281430 |
| 24 | 333506 |
| 25 | 392502 |
| 26 | 459006 |
| 27 | 533630 |
| 28 | 617010 |
| 29 | 709806 |
| 30 | 812702 |
| 31 | 926406 |
| 32 | 1051650 |
| 33 | 1189190 |
| 34 | 1339806 |
| 35 | 1504302 |
| 36 | 1683506 |