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 | 1 |
| 1 | 210 |
| 2 | 11130 |
| 3 | 269570 |
| 4 | 3838590 |
| 5 | 37060506 |
| 6 | 265953170 |
| 7 | 1511679210 |
| 8 | 7125357540 |
| 9 | 28818500830 |
| 10 | 102644594262 |
| 11 | 328512273390 |
| 12 | 959882556570 |
| 13 | 2593322651430 |
| 14 | 6545498596110 |
| 15 | 15564971674518 |
| 16 | 35117045235720 |
| 17 | 75613799423610 |
| 18 | 156153427053890 |
| 19 | 310601807143530 |