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 | 0 |
| 1 | 2 |
| 2 | 28 |
| 3 | 198 |
| 4 | 952 |
| 5 | 3530 |
| 6 | 10836 |
| 7 | 28814 |
| 8 | 68464 |
| 9 | 148626 |
| 10 | 299660 |
| 11 | 568150 |
| 12 | 1022760 |
| 13 | 1761370 |
| 14 | 2919620 |
| 15 | 4680990 |
| 16 | 7288544 |
| 17 | 11058466 |
| 18 | 16395516 |
| 19 | 23810534 |
| 20 | 33940120 |
| 21 | 47568618 |
| 22 | 65652532 |
| 23 | 89347502 |
| 24 | 120037968 |
| 25 | 159369650 |
| 26 | 209284972 |