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 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 9 |
| 7 | 21 |
| 8 | 50 |
| 9 | 122 |
| 10 | 302 |
| 11 | 758 |
| 12 | 1928 |
| 13 | 4958 |
| 14 | 12849 |
| 15 | 33509 |
| 16 | 88122 |
| 17 | 233810 |
| 18 | 621022 |
| 19 | 1641150 |
| 20 | 4411180 |
| 21 | 12364368 |
| 22 | 33073210 |
| 23 | 71807506 |
| 24 | 206985492 |
| 25 | 1354944972 |
| 26 | 3153779248 |
| 27 | -33794258600 |
| 28 | -62697691948 |
| 29 | 2524565441138 |
| 30 | 5004344042337 |
| 31 | -186642439700891 |
| 32 | -368380986364150 |
| 33 | 16196862324254354 |
| 34 | 32039943659306982 |
| 35 | -1602823227559245434 |