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 | 1 |
| 2 | 452 |
| 3 | 6198 |
| 4 | 33594 |
| 5 | 118755 |
| 6 | 324516 |
| 7 | 749398 |
| 8 | 1533686 |
| 9 | 2869719 |
| 10 | 5005980 |
| 11 | 8259888 |
| 12 | 13019358 |
| 13 | 19757815 |
| 14 | 29033576 |
| 15 | 41507700 |
| 16 | 57939438 |
| 17 | 79208745 |
| 18 | 106307256 |
| 19 | 140364532 |
| 20 | 182635562 |
| 21 | 234531357 |
| 22 | 297600576 |
| 23 | 373566942 |
| 24 | 464304450 |
| 25 | 571880029 |
| 26 | 698523980 |
| 27 | 846678498 |