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 | 1 |
| 2 | -7 |
| 3 | 3 |
| 4 | 32 |
| 5 | -55 |
| 6 | -95 |
| 7 | 399 |
| 8 | -11 |
| 9 | -2024 |
| 10 | 2573 |
| 11 | 7137 |
| 12 | -22015 |
| 13 | -9073 |
| 14 | 123712 |
| 15 | -107499 |
| 16 | -498119 |
| 17 | 1168399 |
| 18 | 1090985 |
| 19 | -7323600 |
| 20 | 3535193 |
| 21 | 33005393 |
| 22 | -59095943 |
| 23 | -95072229 |
| 24 | 420022144 |
| 25 | -36762335 |
| 26 | -2099324671 |
| 27 | 2798230719 |
| 28 | 7241608157 |
| 29 | -23295324088 |
| 30 | -8015161307 |
| 31 | 128935159185 |
| 32 | -119396284895 |
| 33 | -509999348249 |