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 | 3 |
| 2 | 7 |
| 3 | 15 |
| 4 | 35 |
| 5 | 79 |
| 6 | 176 |
| 7 | 395 |
| 8 | 883 |
| 9 | 1976 |
| 10 | 4419 |
| 11 | 9882 |
| 12 | 22097 |
| 13 | 49410 |
| 14 | 110485 |
| 15 | 247052 |
| 16 | 552427 |
| 17 | 1235264 |
| 18 | 2762135 |
| 19 | 6176323 |
| 20 | 13810679 |
| 21 | 30881617 |
| 22 | 69053396 |
| 23 | 154408088 |
| 24 | 345266983 |
| 25 | 772040444 |
| 26 | 1726334915 |
| 27 | 3860202221 |
| 28 | 8631674575 |
| 29 | 19301011109 |
| 30 | 43158372875 |
| 31 | 96505055547 |
| 32 | 215791864375 |
| 33 | 482525277735 |