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 | 23 |
| 2 | 137 |
| 3 | -14881 |
| 4 | -503375 |
| 5 | 11755783 |
| 6 | 1256998009 |
| 7 | 1261352591 |
| 8 | -3420191427103 |
| 9 | -82620004548745 |
| 10 | 10166175250198249 |
| 11 | 557692448585640127 |
| 12 | -31009621361385126767 |
| 13 | -3336606569458709073049 |
| 14 | 81283079360068297324505 |
| 15 | 20180807678470966231356527 |
| 16 | -13785930032369364946889279 |