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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | -2 |
| 4 | 23 |
| 5 | 28 |
| 6 | -7 |
| 7 | 22 |
| 8 | 251 |
| 9 | 376 |
| 10 | 149 |
| 11 | 658 |
| 12 | 3143 |
| 13 | 5188 |
| 14 | 4913 |
| 15 | 13102 |
| 16 | 42611 |
| 17 | 75376 |
| 18 | 101549 |
| 19 | 232618 |
| 20 | 612863 |
| 21 | 1137148 |
| 22 | 1831433 |
| 23 | 3928582 |
| 24 | 9185771 |
| 25 | 17574376 |
| 26 | 31162949 |
| 27 | 64717378 |
| 28 | 141392183 |
| 29 | 275609908 |
| 30 | 515347553 |
| 31 | 1052218462 |
| 32 | 2212053731 |
| 33 | 4359537376 |
| 34 | 8396224349 |