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 | -6 |
| 1 | 2 |
| 2 | 18 |
| 3 | -102 |
| 4 | -714 |
| 5 | -4826 |
| 6 | -33222 |
| 7 | -227298 |
| 8 | -1558962 |
| 9 | -10682534 |
| 10 | -73226346 |
| 11 | -501882042 |
| 12 | -3439999878 |
| 13 | -23577981122 |
| 14 | -161606223954 |
| 15 | -1107664654566 |
| 16 | -7592048797962 |
| 17 | -52036670543258 |
| 18 | -356664661728582 |
| 19 | -2444615917773474 |
| 20 | -16755646877311986 |
| 21 | -114844911923314982 |