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 | 7 |
| 2 | 210 |
| 3 | 2205 |
| 4 | 12208 |
| 5 | 47845 |
| 6 | 148638 |
| 7 | 393617 |
| 8 | 922600 |
| 9 | 1970325 |
| 10 | 3902360 |
| 11 | 7270725 |
| 12 | 12868128 |
| 13 | 21811881 |
| 14 | 35617708 |
| 15 | 56319375 |
| 16 | 86565808 |
| 17 | 129780448 |
| 18 | 190285326 |
| 19 | 273509446 |
| 20 | 386137220 |
| 21 | 536375658 |
| 22 | 734131552 |
| 23 | 991339307 |
| 24 | 1322171256 |
| 25 | 1743437850 |
| 26 | 2274824006 |
| 27 | 2939374683 |