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 | 130 |
| 3 | 2190 |
| 4 | 16644 |
| 5 | 78130 |
| 6 | 284700 |
| 7 | 823550 |
| 8 | 2130440 |
| 9 | 4789539 |
| 10 | 10156900 |
| 11 | 19487182 |
| 12 | 36450360 |
| 13 | 62748530 |
| 14 | 107061500 |
| 15 | 171104700 |
| 16 | 272696336 |
| 17 | 410338690 |
| 18 | 622640070 |
| 19 | 893871758 |
| 20 | 1300395720 |
| 21 | 1803574500 |
| 22 | 2533333660 |
| 23 | 3404825470 |
| 24 | 4665663600 |
| 25 | 6103906275 |
| 26 | 8157308900 |
| 27 | 10474721820 |