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 | 18 |
| 3 | 198 |
| 4 | 1300 |
| 5 | 5895 |
| 6 | 20646 |
| 7 | 60028 |
| 8 | 151848 |
| 9 | 344925 |
| 10 | 719290 |
| 11 | 1399266 |
| 12 | 2569788 |
| 13 | 4496323 |
| 14 | 7548750 |
| 15 | 12229560 |
| 16 | 19206736 |
| 17 | 29351673 |
| 18 | 43782498 |
| 19 | 63913150 |
| 20 | 91508580 |
| 21 | 128746431 |
| 22 | 178285558 |
| 23 | 243341748 |
| 24 | 327771000 |
| 25 | 436160725 |
| 26 | 573929226 |